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Mycotoxicosis Due to Fusarium Toxins (Fungal Poisoning Caused by the Mold Toxin from Fusarium Species) in Dogs

Occurrence: very rare
Location of illness: General/Whole body

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Mycotoxicosis due to Fusarium toxins is a condition in dogs caused by ingesting mold toxins produced by Fusarium species. These toxins can be found in various foods and feeds and lead to a range of health problems, ranging from gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. disorders to severe systemic diseases.

The most important facts at a glance

Mycotoxicosis in dogs is caused by Fusarium molds that produce mycotoxins such as deoxynivalenol, zearalenone, and fumonisins. These toxins can be found in contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. foods and cause health problems in dogs. Puppies and older dogs are particularly at risk. Typical symptoms include loss of appetite, Vomiting, and DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., while severe cases may show neurological symptoms such as Seizures. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. requires a thorough examination and tests for mycotoxins in the dog’s food and body. Treatment depends on the severity of the symptoms and can range from administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. to long-term therapies to support organ functions. Rapid identification and eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin. of the contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. food source is crucial. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on the type and amount of toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. ingested. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. includes controlling feed quality and storing it in cool conditions. Research focuses on developing effective diagnostic and treatment strategies and investigating the immunological responses of dogs. Advances in research could lead to new therapies and better preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies to protect the health of dogs.

Causes

Fusarium species are widespread molds found in the environment, especially in agricultural products such as grains, corn, and feed. Under moist and warm conditions, these fungi can thrive and produce mycotoxins.

The main mycotoxins produced by Fusarium that are harmful to dogs include deoxynivalenol (DON), also known as vomitoxin, zearalenone, and fumonisins. These toxins can be found in contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. foods and enter the dog’s body through the food chain.

Sensitivity to these toxins can vary from dog to dog, depending on factors such as the size of the dog, the amount and duration of ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems., and the animal’s general health. In particular, puppies and older dogs may be more susceptible to the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of mycotoxicosis due to Fusarium toxins in dogs can be varied and depend on the type and amount of toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. ingested. AcuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. symptoms often appear quickly after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and can include Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., loss of appetite, and AbdominalThe term “abdominal” refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain.

ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to Fusarium toxins can lead to more serious health problems, including liver and kidney damage, immunosuppressionImmunosuppression is a state of reduced activity or effectiveness of the immune system. In dogs and cats, immunosuppression can occur naturally or be caused by certain medications, diseases, or medical treatments., hormonal disorders, and, in severe cases, neurological symptoms such as ataxia or tremors. These symptoms can occur over a longer period of time and are often more difficult to diagnose.

Another important aspect is the potential impairment of reproductive ability by certain mycotoxins, such as zearalenone, which has estrogenic effects and can lead to fertilityFertility refers to the ability to conceive and bear offspring. In women, it refers to the ability to initiate and carry a pregnancy; in men, it refers to the ability to produce fertile sperm. problems.

Diagnosis

Diagnosing mycotoxicosis due to Fusarium toxins requires a thorough historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and clinical examination. The veterinarian will ask about the feeding historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and may suggest testing the feed for mycotoxins, especially if contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. food is suspected.

Laboratory tests can help support the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. Blood tests can indicate signs of liver or kidney damage, and specific tests can be performed to confirm the presence of mycotoxins in the blood or urine. In some cases, biopsies of affected organs may also be necessary.

In addition, the analysis of feed samples for mycotoxins can help identify the source of the poisoning. These analyses should be performed by specialized laboratories that are able to accurately quantify mycotoxins.

Therapy

Treatment for mycotoxicosis depends on the severity of the symptoms and the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. involved. In acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. cases, immediate treatment may be necessary to stop the absorption of the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. and relieve the symptoms. This may include administering activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body., intravenous fluids to support kidney function, and medications to control Vomiting and DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems..

In chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. cases, longer-term treatment is required, focusing on supporting the affected organs. This may include hepatoprotective agents, diets to support liver and kidney function, and regular monitoring of organ function.

It is important to identify and eliminate the contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. food source to prevent further exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats.. In some cases, a change in diet may be necessary to ensure that the animal does not receive any further contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. feed.

Prognosis and follow-up care

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for mycotoxicosis due to Fusarium toxins depends on several factors, including the type and amount of toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. ingested, the duration of exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats., and timely and appropriate treatment. In cases of acute poisoning, rapid treatment can lead to a full recovery, especially if exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. was limited.

In chronic exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats., the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may vary. Dogs suffering from serious organ disease or neurological symptoms may have a poorer prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. and require intensive and long-term medical care. Early detection and diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. are crucial for improving the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop..

Prevention

The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of mycotoxicosis in dogs focuses primarily on controlling feed quality. It is important to ensure that dog food comes from reliable sources and is regularly checked for contaminationContamination refers to the pollution of surfaces, objects, water, food, or air with harmful microorganisms, chemicals, or other hazardous substances.. Avoid buying food that shows visible signs of mold or smells unpleasant.

Store dog food in dry and cool conditions to prevent the growth of mold. Make sure to seal open food bags well and use them within a reasonable period of time.

Regular checks and tests for mycotoxins in feed, especially in products that are susceptible to mold infestation, can help minimize the risk of mycotoxicosis. Consult your veterinarian to develop appropriate preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies and monitor the risk.

Outlook on current research

Mycotoxicosis due to Fusarium toxins is a complex and multifaceted disease triggered by the consumption of food contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. with Fusarium molds. These fungi produce various toxins that can cause a range of health problems in dogs. Current research focuses on understanding the exact mechanisms of toxin action, as well as developing effective diagnostic and treatment strategies.

A significant area of research is the identification and characterization of the various Fusarium toxins found in the environment. Scientists use advanced analytical techniques to study the structure and biochemical properties of these toxins. These findings are crucial to understanding the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects at the cellularCellular refers to cells or consisting of cells. In biology and medicine, it refers to processes, structures, or functions that occur at the level of individual cells. level and to developing risk assessments for exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to these toxins in dogs.

Another important aspect of current research is the investigation of the immunological responses of dogs to Fusarium toxins. Researchers are trying to find out how the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. responds to these toxins and what role genetic factors play in susceptibility to mycotoxicoses. These studies could lead to new therapies that modulate the immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. and alleviate the symptoms of the disease.

In addition, intensive work is being carried out on the development of rapid tests that enable the early detection of Fusarium toxins in food. These tests could help prevent the contaminationContamination refers to the pollution of surfaces, objects, water, food, or air with harmful microorganisms, chemicals, or other hazardous substances. of dog food and thus significantly reduce the risk of mycotoxicosis. The research focuses on improving the specificity and sensitivity of these tests to ensure reliable monitoring.

Long-term research projects deal with the breeding of Fusarium-resistant cereal varieties in order to reduce the contaminationContamination refers to the pollution of surfaces, objects, water, food, or air with harmful microorganisms, chemicals, or other hazardous substances. of food with these toxins. These agricultural science approaches could be of great importance not only for animal health but also for human nutrition. The research aims to develop plants that are less susceptible to Fusarium infestation through genetic modification or selective breeding.

In the field of therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. development, new drugs are being tested that can neutralize the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects of Fusarium toxins or accelerate the excretion of the toxins from the body. In addition, alternative treatment methods, such as the use of probiotics to strengthen the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. flora, are being investigated to increase the resilience of dogs to toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats..

Another area of research is the investigation of the environmental factors that favor the growth of Fusarium molds. By understanding the ecological conditions that lead to increased toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. production, effective preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies can be developed. These include measures to improve the storage and processing of food to minimize contaminationContamination refers to the pollution of surfaces, objects, water, food, or air with harmful microorganisms, chemicals, or other hazardous substances..

Finally, research into the effects of chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to low doses of Fusarium toxins is an important area. Long-term studies aim to understand the cumulative effects of this exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. on the health of dogs and to identify possible long-term damage. These studies are crucial for developing comprehensive guidelines for safe exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to Fusarium toxins.

Research in the field of mycotoxicosis due to Fusarium toxins in dogs is dynamic and multidisciplinary. Advances in toxicology, immunology, agricultural science, and food technology are helping to reduce the risk of this disease and protect the health of dogs worldwide. In the coming years, we expect significant breakthroughs that will further improve the understanding and management of this disease.

Frequently asked questions (FAQs)

What are Fusarium toxins? Fusarium toxins are harmful substances produced by molds of the genus Fusarium. These toxins can be found in food and are harmful to the health of humans and animals.
How can dogs ingest Fusarium toxins? Dogs can ingest Fusarium toxins mainly through the consumption of contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. feed. This can be the case, in particular, with industrially manufactured feed that has been produced with contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. cereals.
What symptoms can occur with mycotoxicosis due to Fusarium toxins? Symptoms include Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., loss of appetite, lethargy, and in severe cases, Seizures and liver or kidney damage.
How is mycotoxicosis diagnosed in dogs? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a combination of historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., clinical symptoms, and laboratory tests that can detect the presence of toxins in the body.
What treatment options are available for dogs with mycotoxicosis? Treatment usually involves removing the source of the toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi., symptomatic treatment such as fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., and, if necessary, administering medication to support liver function.
Can all dogs be affected by mycotoxicosis? Yes, in principle, all dogs can be affected, especially if they ingest contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. feed. However, some dogs may be more susceptible due to genetic differences or a weakened immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body..
How can exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to Fusarium toxins be prevented? ExposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. can be prevented by purchasing high-quality, tested dog food and storing food properly. Regular checks and controls by feed manufacturers are also important.
What are the long-term consequences of mycotoxicosis in dogs? Long-term consequences can include liver damage, kidney damage, and an increased susceptibility to infections. In some cases, neurological damage can also occur.
Are there risk factors for the development of mycotoxicosis in dogs? Yes, risk factors include a weakened immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body., existing liver or kidney disease, and regular consumption of poor quality or contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. feed.
Are Fusarium toxins also dangerous for other animals? Yes, Fusarium toxins are dangerous not only for dogs but also for other animals such as cats, horses, and livestock. However, the symptoms and sensitivity may vary depending on the animal species.