Skin Lesions in Dogs
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
ORANGE for extensive, deep, or very painful lesions, weeping/pus, ulceration/bleeding, fever/apathy, rapid spread, or mucous membrane involvement; RED for signs of shock.
Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity
Definition
Skin lesions in dogs are visible or palpable changes in the skin that can take various forms, such as redness, swelling, ulcers, or crusts.
Can Occur with the Following Diseases:
- Malignant Adrenal Gland Tumor in Dogs (Adrenocortical Carcinoma)
- Bartonella Infection in Dogs (Bartonellosis)
- Bacterial infection caused by Brucella canis in dogs (Brucellosis)
- Candida Infection in Dogs (Candidiasis)
- Gluten Sensitivity in Dogs (Canine Gluten Sensitivity)
- Inflammation of the skin, muscles, and blood vessels in dogs (Dermatomyositis)
- External Parasite Infestation of the Skin in Dogs (Ectoparasite Infestation)
- Skin Lymphoma in Dogs (Epidermotropic Lymphoma, T-Cell Lymphoma)
- Flea Infestation in Dogs (Ctenocephalides)
- Skin Hypersensitivity Reaction to Flea Saliva in Dogs (Flea Allergy Dermatitis)
- Food Hypersensitivity Reaction in Dogs (Food Allergy)
Basics and possible causes
The skin is the largest organ in the dog and serves as a protective barrier against external influences. It consists of several layers, each performing specific functions. If this barrier is breached or damaged, skin lesions can occur.
There are numerous causes of skin lesions in dogs, ranging from harmless to severe conditions. One of the most common causes is an allergic reaction, whether to environmental allergens like pollen or to food components. Allergies often lead to severe itching, which causes the dog to scratch and thus injure the skin.
Parasites such as fleas, ticks, or mites are also common triggers of skin problems. These parasites can not only cause direct damage to the skin but also transmit diseases that provoke further skin reactions.
Infections caused by bacteria, fungi, or viruses can lead to skin lesions. Bacterial infections, such as pyoderma, are often secondary infections that develop when the skin is damaged by scratching or other injuries. Fungal infections, like the well-known ringworm, can also cause skin lesions, which often appear as circular, hairless patches.
Autoimmune diseases, where the dog’s immune system mistakenly attacks its own tissue, can also cause skin lesions. Such diseases are often difficult to diagnose and require special tests.
Additionally, hormonal disorders, such as Cushing’s syndrome or hypothyroidism, can impair skin health and lead to lesions. These conditions disrupt the balance of hormones in the body, which can negatively affect the skin and coat.
Typical accompanying symptoms
- Itching: Many skin lesions are accompanied by significant itching, which causes the dog to scratch, bite, or lick intensely.
- Redness and swelling: Affected skin areas may appear red and swollen, indicating an inflammatory reaction.
- Crusts and scales: The formation of crusts on the skin surface or the flaking of scales is often observed.
- Hair loss: Localized or widespread hair loss can occur in conjunction with skin lesions, especially with fungal infections or parasite infestations.
- Ulcers or open wounds: In more severe cases, open wounds or ulcers can form, which are susceptible to secondary infections.
- Behavioral changes: Due to discomfort or pain, the dog may show signs of behavioral changes, such as lethargy or aggression.
When to visit the vet?
A visit to the veterinarian is urgently required if skin lesions are accompanied by other serious symptoms, such as fever, loss of appetite, or lethargy. These may indicate a systemic disease that requires immediate treatment.
If skin lesions do not heal within one to two weeks despite home care, or even worsen, a veterinarian should also be consulted. An accurate diagnosis is important to identify and correctly treat the underlying cause.
At the first sign of a secondary infection, such as pus or strongly foul-smelling skin, an immediate veterinary visit is necessary to initiate appropriate treatment with antibiotics or other medications.
Symptom recognition for animal owners and veterinary diagnostic procedures
It is important for the pet owner to regularly check their dog’s skin for changes. The coat should be examined for bald spots, crusts, or redness. Changes in the dog’s behavior, such as frequent scratching or licking, should also be observed.
The veterinarian will take a thorough medical history to identify possible triggers or pre-existing conditions. A physical examination of the skin is crucial to determine the type of lesions. The veterinarian can perform various diagnostic tests, such as skin swabs, biopsies, or blood tests, to identify infections, parasites, or allergic reactions.
Skin tests, such as an allergy test or a fungal culture, can be performed to identify specific causes. In cases of suspected systemic illness, further diagnostic procedures, such as ultrasound or X-ray, may be necessary.
What can pet owners do and professional therapy options
The pet owner can help alleviate the symptoms by cleaning the affected skin areas with a mild, dog-friendly shampoo. This can help remove excess scales or crusts and soothe the skin. However, it is important not to use aggressive products or products intended for humans, as these can irritate the dog’s skin.
Preventing excessive scratching is crucial to avoid further damage. Special Elizabethan collars or protective clothing can be used for this purpose. The pet owner should also ensure that the dog does not have access to potential allergens, whether in the environment or in food.
A balanced diet can contribute to skin health. Omega-3 fatty acids, which are contained in fish oil, can have an anti-inflammatory effect and strengthen the skin barrier. However, the pet owner should consult with the veterinarian before administering dietary supplements.
Regular check-ups with the veterinarian are important to monitor the healing process and adjust the treatment if necessary. The pet owner should follow the veterinarian’s instructions carefully to ensure effective treatment.
Outlook on current research
Current research on skin lesions in dogs increasingly focuses on identifying specific biomarkers that can help determine the cause of the lesions. Advances in molecular diagnostics have made it possible to identify specific proteins and genetic markers associated with inflammatory skin diseases. In the future, this could significantly improve diagnosis and therapy by enabling veterinarians to develop more targeted treatments.
Another significant area of research is the role of the skin’s microbiome in the development and healing of skin lesions. Studies show that the balance of microorganisms on the skin surface plays an important role in skin health. Disruptions in this microbiome can lead to skin lesions or delay their healing. Future therapeutic approaches may therefore include probiotic treatments aimed at restoring the natural balance of the skin flora.
In immunology, intensive research is being conducted on how the immune system of dogs reacts to skin lesions. There is evidence that inflammatory processes are not only the cause of lesions but also influence their healing. New therapeutic approaches aim to modulate inflammatory reactions to accelerate healing and prevent recurrence.
Another research area investigates the influence of environmental factors on the development of skin lesions in dogs. Factors such as air pollution, nutrition, and stress are subjects of current studies, as they may play a role in exacerbating skin problems. This research could lead to the development of preventive measures to reduce the occurrence of skin lesions.
Furthermore, there are advances in the development of new topical treatments that work in innovative ways. For example, nanotechnology-based creams are being researched that can deliver medication more efficiently and targeted to affected skin areas. Such advanced treatments could reduce the side effects of conventional therapies and accelerate healing processes.