Home » Diseases » In dogs » Pneumonia

Pneumonia in Dogs

Occurrence: common
Location of illness: Chest

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

Pneumonia is an inflammatory condition of the lungs caused by infections with bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi. It leads to an accumulation of fluid and pus in the alveoli, which makes breathing difficult.

The most important facts at a glance

Pneumonia in dogs is an inflammation of the pulmonaryPulmonary refers to the lungs or the respiratory system. Pulmonary diseases in dogs and cats include conditions such as Pneumonia, asthma, and pulmonary hypertension. alveoli that impairs gas exchange. This condition is often caused by bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. such as Bordetella bronchiseptica, Streptococcus zooepidemicus, and Escherichia coli, which enter the lungs via the respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs.. Viruses, such as canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. distemper virusA virus is a microscopic infectious particle that cannot reproduce on its own and must infect a host cell to produce new virus particles. Viruses can cause a variety of diseases in humans, animals, and plants., and occasionally fungi can also be triggers. Symptoms include cough, fever, and abnormal respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. sounds. 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 made by clinical examination, X-rays, and blood tests to detect infections. Treatment depends on the cause: Bacterial infections require antibiotics, while viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. infections are treated symptomatically. Fungal infections require antifungals. 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 severity of the disease and the response to treatment. Preventive measures include vaccinations, good hygiene, and regular veterinary examinations. Research focuses on identifying pathogens, developing new vaccines, and investigating alternative therapies. Advances in diagnostics and treatment could improve the quality of life of affected dogs.

Causes

The lungs consist of small air sacs, the alveoli, which are responsible for gas exchange. In pneumonia, these alveoli become inflamed, which impairs the absorptionAbsorption refers to the uptake of substances by living cells or tissues. In the context of veterinary medicine, it often refers to the absorption of nutrients, drugs, or toxins from the digestive tract into the bloodstream. of oxygen and the release of carbon dioxide. The inflammation can be triggered by various microorganisms that enter the lungs and attack the tissue.

One of the main causes of pneumonia in dogs is bacterial infections. BacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. such as Bordetella bronchiseptica, Streptococcus zooepidemicus, and Escherichia coli are often involved. These bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. can spread through the upper respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs. and enter the lungs.

Viruses can also cause pneumonia, including canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. distemper virusA virus is a microscopic infectious particle that cannot reproduce on its own and must infect a host cell to produce new virus particles. Viruses can cause a variety of diseases in humans, animals, and plants. and canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. adenovirus. These viruses weaken 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., making secondary bacterial infections more likely to occur. Fungal infections, such as those caused by Aspergillus or Histoplasma, are less common, but they can also lead to pneumonia.

Other factors that increase the risk of pneumonia include environmental conditions, such as inhaling irritants or allergens, as well as the presence of underlying diseases such as heart disease or immunodeficiency.

Symptoms

Very common symptoms:

Common symptoms:

Reduced Appetite or Loss of Appetite (Anorexia)

The symptoms of pneumonia in dogs can vary depending on the severity of the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and the causative agent. Common symptoms include cough, which may be dry or productive, and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, where the dog has difficulty breathing normally.

Other symptoms may include nasal discharge, fever, and general weakness. The dog may also show signs of loss of appetite and weight loss. In severe cases, cyanosisCyanosis refers to a bluish discoloration of the skin and mucous membranes, caused by an inadequate oxygen supply to the blood. It can be a sign of heart, lung, or blood diseases. may occur, a bluish discoloration of the mucous membranes, indicating a lack of oxygen in the blood.

Some dogs also show symptoms such as rapid breathing or an increased respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. rate, as the body tries to take in more oxygen to meet the demand.

Diagnosis

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. of pneumonia in dogs usually begins with a thorough clinical examination, in which the veterinarian looks for symptoms such as cough, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. sounds, and fever. A complete medical 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., including questions about possible exposures to infectious agents, is also important.

Chest X-rays are an essential part of 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., as they can reveal abnormalities in the lungs, such as fluid accumulation or consolidation of lung tissue. These images also help to rule out other conditions such as tumors or heart problems.

A blood testA blood test is a laboratory procedure in which blood is drawn and analyzed to obtain information about the body's health. It can include various parameters such as blood sugar, blood count, liver and kidney values. can provide evidence of an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., e.g., through elevated white blood cells. In some cases, a tracheal wash or bronchoalveolar lavageBronchoalveolar lavage is a medical procedure in which a portion of the lung is rinsed with a small amount of sterile fluid to collect cells and other components for diagnostic purposes. It is often used to make a diagnosis of lung diseases. may be performed to obtain samples from the airways. These samples are then examined for bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi.

Therapy

The treatment of pneumonia depends on the cause. For bacterial infections, antibiotics are prescribed, adapted to the specific pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites.. A culture and sensitivity test can help determine the most effective antibiotic.

For viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. infections, treatment focuses on relieving symptoms and supporting breathing, as there are no specific antiviral drugs. This may include administering oxygen, 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 anti-inflammatory medications.

Fungal infections are treated with antifungals, which are also tailored to the specific pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites.. Long-term treatment is often necessary because fungal infections can be persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside..

In addition, the veterinarian may recommend respiratory therapies, such as inhalations or chest percussionPercussion is a diagnostic method in medicine that involves lightly tapping on specific areas of the body to produce sounds. The resonance and sound quality can provide information about the condition and function of organs and tissues., to facilitate the coughing up of mucus.

Prognosis and follow-up care

The prognosis for dogs with pneumonia depends on several factors, including the cause of the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., the severity of the disease, and the dog’s responsiveness to treatment. Early 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. and treatment significantly improve the chances of a full recovery.

With timely and appropriate treatment, many dogs recover completely from pneumonia. However, in severe or complicated cases, especially in the presence of underlying diseases, complications can occur that worsen 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..

Long-term damage to the lungs is rare but can occur with severe or repeated infections. In such cases, ongoing veterinary care is required.

Prevention

The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of pneumonia in dogs can be achieved through a combination of vaccinations, good hygiene, and regular veterinary care. Vaccinations against common viruses, such as canine distemper virusA virus is a microscopic infectious particle that cannot reproduce on its own and must infect a host cell to produce new virus particles. Viruses can cause a variety of diseases in humans, animals, and plants. and canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. adenovirus, are important to reduce the risk of viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. infections.

Good hygiene practices, such as regularly cleaning sleeping areas and avoiding contact with infected animals, can also help minimize the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.. A balanced diet and regular exercise strengthen the dog’s 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..

Regular veterinary examinations make it possible to identify and treat health problems early before they can lead to pneumonia. For dogs with known risk factors, the veterinarian should recommend specific preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures.

Outlook on current research

Research on pneumonia in dogs is constantly advancing, with many studies focusing on the causes, preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring., and treatment options. A significant area of research is the identification of the bacterial and viral pathogens most commonly associated with pneumonia in dogs. Through the use of modern molecular techniques such as PCR (polymerase chain reaction)The polymerase chain reaction is a molecular biology technique used to replicate and analyze specific DNA sequences. In veterinary medicine, PCR is used for diagnostic purposes, including the identification of pathogens., scientists can identify specific pathogens more quickly and accurately. This helps veterinarians develop more targeted and effective treatment plans.

Another promising area of research is the development of vaccines that aim to protect dogs from the common pathogens of pneumonia. While vaccines against some bacterial infections, such as Bordetella bronchiseptica, already exist, work is underway to extend protectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment. against other pathogens. The development of new vaccines could significantly reduce the risk of pneumonia and improve the overall health of the dog populationIn veterinary medicine, the term population refers to a group of animals of a particular species living in a specific geographic area or environment..

The role of antibiotics in the treatment of pneumonia in dogs is also being intensively investigated. The increasing antibiotic resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins. poses a serious challenge, which is why researchers are evaluating alternative treatment methods, including new antibiotic classes and non-antibiotic therapies. These include, for example, inhalable treatments that act directly on the lungs, or the use of immunomodulatorsImmunomodulators are substances that affect the immune system by increasing or decreasing its activity. They are used in dogs and cats to treat autoimmune diseases, allergies, or as cancer therapy. that strengthen the dog’s 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. to better fight off infections.

The study of the pathophysiologyPathophysiology deals with the changes in physiological processes caused by diseases or injuries. It examines how these changes lead to the symptoms and signs of a disease. of pneumonia in dogs is also of great importance. Scientists are investigating how the disease develops 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 how the dog’s 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 it. These findings could lead to new diagnostic methods that enable earlier and more accurate detection of the disease, which in turn could improve 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 affected dogs.

Overall, future research will continue to aim to gain a better understanding of pneumonia in dogs, develop new preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and treatment strategies, and improve the quality of life of dogs with this disease. Through interdisciplinary approaches that combine veterinary medicine, biotechnology, and immunology, scientists hope to make significant progress in the fight against this common and often serious disease.

Frequently asked questions (FAQs)

What is pneumonia in dogs? Pneumonia is an inflammatory disease of the lungs that can be caused by various pathogens such as bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi. It leads to symptoms such as cough, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, and fever.
What causes pneumonia in dogs? The most common causes of pneumonia in dogs are bacterial infections, but viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. infections, fungi, parasites, and inhaled foreign bodies can also play a role. 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. can also increase the risk.
How is pneumonia diagnosed in dogs? 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. is usually made through a combination of clinical examination, chest X-rays, blood tests, and sometimes also through a bronchoscopyBronchoscopy is a diagnostic and therapeutic procedure in which the inside of the airways is directly viewed with a bronchoscope, a thin, flexible viewing tube. It can be used to take tissue samples or remove foreign objects. or a culture of the respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. secretions to identify the pathogen.
How is pneumonia treated in dogs? The treatment depends on the cause but often includes antibiotics to combat bacterial infections. SupportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures 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., oxygen administration, and cough suppressants may also be necessary.
Can all dogs get pneumonia? Yes, all dogs can get pneumonia, but puppies, older dogs, and dogs with weakened immune systems are particularly at risk. Certain breeds with flat noses, such as bulldogs, may also be more susceptible due to their anatomyAnatomy is the scientific study of the structure of living things. It deals with the construction and organization of organisms, including their systems, organs, and tissues..
How can pneumonia be prevented in dogs? Prevention can be achieved through timely vaccinations, good hygiene, and avoiding stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being.. Regular veterinary visits and early detection of respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. diseases can also help reduce the risk.
Is pneumonia contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious. in dogs? Pneumonia itself is not directly contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious., but the pathogens that cause it can be transmitted from dog to dog under certain circumstances. Therefore, it is important to isolate sick dogs from others until they recover.
How long does it take to recover from pneumonia in dogs? The recovery time can vary depending on the severity of the disease and the general health of the dog. It usually takes several weeks for a dog to fully recover, especially if treatment is started early and consistently.
Can home remedies help treat pneumonia? While home remedies can relieve symptoms, they should never replace professional veterinary treatment. Measures such as providing a warm and humid environment can help, but the cause of the pneumonia must always be treated medically.
When should I take my dog to the vet if I suspect pneumonia? If your dog shows symptoms such as persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. cough, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, loss of appetite, or lethargy, you should see a veterinarian as soon as possible. Early 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. and treatment are crucial for a successful recovery.