Skin Diseases in Dogs - What are the most common dog skin diseases & How to recognize them

The skin is a major organ with a significant role in protecting dogs' bodies against physical, chemical, and biological agents. An optimal balance of skin barriers supports the overall health of canines and prevents infection with bacteria, fungi, or external parasites. Proper skin care and regular veterinary check-ups lead to early identification of lesions and appropriate treatment at the right time. Skin conditions in dogs appear for various reasons, from bacterial, fungal, or parasitic infections to autoimmune reactions or nutritional deficiencies. Regardless of the cause, skin diseases in dogs always require specialized medical evaluation.

What should my dog's skin look like?

The color and texture of dog skin depend on genetics and environmental conditions. Healthy skin does not show dandruff, wounds, or excoriations, is well-hydrated, and has a normal smell. Practices for monitoring the appearance of dog skin are recommended by veterinarians, as they can help in the early identification of any skin diseases that require treatment.

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What are the most common skin diseases in dogs?

Veterinary medicine highlights a large number of skin conditions that affect the quality of life of canines. Dermatitis, mange, canine lupus, allergies, furunculosis, or lick granulomas are the most common skin diseases in dogs, most of which are easily treatable, provided they are detected early and taken to the veterinarian immediately. Skin diseases, depending on their type, benefit from different treatments. Sometimes, appropriate food can reduce the symptoms of the condition, and medicinal treatments are not always necessary.

Pyotraumatic Dermatitis

Pyotraumatic dermatitis frequently occurs in the context of self-inflicted trauma, when the dog excessively chews, scratches, or licks an area. Pyotraumatic dermatitis in dogs affects areas easily accessible for licking and predominantly occurs in breeds with thick fur and long hair, such as Labradors, Golden Retrievers, Saint Bernards, or German Shepherds.

Symptoms: the dog experiences obvious discomfort, manifested by itching, crying, or even aggression when touched. The initial lesion becomes complicated by bacterial colonization, followed by inflammation, purulent exudate, and the formation of a sticky plaque on the skin surface.

Treatment: involves cleaning, local disinfection, and the application of supplements that support the restoration of skin integrity, but only after removing the hair from the affected region. Because it can cause intense pain, hair removal should only be performed by a veterinarian, so that the dog receives pain medication and the owner is not exposed to the risk of being bitten.

Pressure Point Furunculosis

Pressure point furunculosis is a dermatological condition that primarily affects the deep layers of the skin, developing as a result of contracting a bacterial infection, predominantly with Staphylococcus pseudintermedius, a common pathogen involved in skin infections in dogs. Large or giant breeds, such as Great Danes, Dobermans, Saint Bernards, as well as Dachshunds and Basset Hounds (especially in the chest area), are more susceptible to developing the disease due to their body structure and tendency to rest on hard and rough surfaces.

Symptoms: thickening of the skin in the affected areas, followed by the formation of painful boils. If the infection is not treated promptly and correctly, it can progress to cellulitis, a more severe form of inflammation of the subcutaneous tissues, causing intense pain and continuous suppuration.

Treatment: involves the application of antiseptics, such as chlorhexidine or benzoyl peroxide, for cleaning and disinfecting the lesions. Antiseptics can be administered by shampooing or by direct application of special creams and gels, as well as by using antiseptic sprays and lotions, but only by the veterinarian, in correct proportions. In addition, antibiotic administration is necessary to combat bacterial infection and prevent complications, with treatments that can last between 6 and 12 weeks, depending on the severity of the infection and the animal's response to therapy.

Folliculitis in short-haired dog breeds

Folliculitis involves inflammation of the hair follicles, generally due to a bacterium that colonizes the skin, with a progressive character, starting with the appearance of red blisters and purulent pustules on the skin surface. The disease mainly appears in short-haired breeds, such as Doberman or Boxer. Compared to other skin diseases in dogs, folliculitis might be more difficult to observe in its early stages.

Symptoms: blisters and purulent pustules, along with itching, are common symptoms. The itching associated with the condition, if it occurs, forces the dog to repetitive scratching, which accentuates inflammation and can introduce other pathogens into the lesion.

Treatment: antiseptic veterinary shampoos and antibiotic medications are used to reduce inflammation and prevent relapses.

Lick Granulomas

Lick granulomas are lesions that appear on the limbs, especially on the anterior part of the legs. The dog repeatedly chews or licks the same area, and the prolonged contact between the tongue and the skin leads to repeated microtraumas, which stimulates a chronic inflammatory process and the formation of firm, slightly prominent nodules. Bacteria subsequently colonize the wound and cause pain and swelling. Lick granulomas can be easily confused with other skin diseases in dogs, which is why a differential diagnosis performed by a veterinarian is necessary.

Symptoms: open lesions on the limbs, in the anterior region. As the condition progresses, intense itching appears, the skin thickens, and hair falls out.

Treatment: involves eliminating the initial problem that causes pruritus or discomfort, along with behavioral measures that prevent self-mutilation. In situations where skin diseases such as dermatitis or eczema cause uncomfortable sensations, treating the primary cause reduces the intensity of itching and stops the worsening of lesions. There are recommendations for using a protective collar and bitter-tasting sprays applied to the affected surface to discourage constant licking. In certain cases, the veterinarian may recommend antidepressant or anxiolytic medications when there is a strong emotional factor in triggering self-mutilation.

Sarcoptic or Demodectic Mange

Mange or canine scabies occurs following infestation with a highly contagious mite, Demodex canis, which spreads rapidly to other animals and even humans. Mange can also be contracted from the external environment, even without obvious direct contact with another animal. Poor nutrition or long-term corticosteroid treatments can increase a dog's likelihood of developing mange.

Symptoms: the dog may experience intense itching, hair loss, and scabs on large areas of skin. If immediate measures are not taken, severe secondary infections can occur. Additionally, without treatment, the dog may stop eating, and the animal could even die.

Treatment: mandatory performed by the veterinarian, treatment involves bathing with acaricidal substances combined with water, administration of antibiotics (to prevent possible bacterial infections caused by scratching), and, if necessary, administration of avermectins or immunostimulants. In the case of dogs with kidney conditions, the use of avermectins should be avoided to prevent complications. If avermectins are administered, hepatoprotectives and nutritional supplements may be simultaneously necessary.

Canine Lupus

Canine lupus is a complex autoimmune disorder characterized by the body's abnormal immune reaction against its own tissue structures. The disease manifests in two main forms: systemic lupus erythematosus and discoid lupus erythematosus, each with distinct causes and clinical manifestations. The first form also affects joints, kidneys, heart, and other organs, while the second is localized especially on the face and nose, producing ulcers, discolorations, and scabs. Diagnosis requires serological tests and, sometimes, skin biopsies for confirmation.

Symptoms: include symmetrical lesions, sun sensitivity, and inflamed areas on the nasal bridge.

Treatment: is based on immunosuppressive drugs and protection from ultraviolet radiation. The veterinarian monitors clinical parameters, blood tests, and drug tolerance to adjust the therapeutic regimen. Some cases remain in remission for long periods if the indications are followed. Proper general care, an adequate diet, and avoiding accentuated stress are adjuvant factors. Close collaboration between the owner and the veterinarian ensures comfort and a better life expectancy for dogs diagnosed with lupus.

Food Allergies

Food allergies occur when the immune system reacts to certain proteins in food and triggers skin inflammation. Signs include intense itching, erythema, wounds from excessive scratching, and sometimes diarrhea or vomiting. Different types of proteins, chicken, beef, dairy, or eggs, can be involved, which is why a correct diagnosis requires an exclusion protocol. Suspect foods are replaced with hypoallergenic diets or formulas based on hydrolyzed proteins. The testing period reaches eight to ten weeks, and improvement of symptoms suggests an allergic reaction to a previous ingredient. Gradual reintroduction of initial components confirms the source of the allergy. Once the problem food is identified, long-term avoidance is necessary to limit the recurrence of dermatitis.

Once you notice that your dog has one of the problems above, take him to the veterinarian immediately. The symptoms are often similar, and it is difficult to make a diagnosis. There is no general treatment valid for all dermatological diseases your dog might suffer from; therefore, it is very important for the specialist to make a correct diagnosis, establish the medication for the respective condition, and further recommend what is the appropriate food for him and what supplements to give him. Below are the most common dog skin diseases, what causes them, what their symptoms are, and how they are treated.

Main Causes of Dog Skin Diseases

Canine dermatological conditions have varied causes, including bacterial, fungal, parasitic infections, allergic reactions, and autoimmune disorders. Interaction with irritating substances is another decisive factor, especially when the skin suffers micro-lesions. Reduced immunity, due to stress or other systemic pathologies, increases the likelihood of colonization by pathogenic germs. Sudden changes in temperature and humidity, lack of proper hygiene, and nutrient deficiencies put additional pressure on the skin barrier. Genetic factors also play an important role in susceptibility to certain conditions, so breeds with prominent skin folds or very short hair frequently develop skin diseases.

Insect Bites

Mosquito, flea, or tick bites can generate acute inflammatory reactions and severe itching. Some insects inject irritating substances that activate the local immune response, and in hypersensitive dogs, accentuated dermatitis appears. Fleas are a common example; their bites lead to repetitive itching and secondary lesions from scratching. Ticks cause inflammation at the attachment site and, additionally, transmit pathogens responsible for systemic diseases, which complicates the prognosis.

Contact Dermatitis

Contact dermatitis occurs when the skin interacts with irritating or allergenic substances. Inadequate cleaning products, aggressive disinfectants, or toxic latex plants are among the frequently mentioned causes of dermatitis. The affected body surface becomes red, painful, and intensely itchy. In some cases, small vesicles may appear and can rupture. Dermatitis in dogs has a favorable prognosis if intervention is rapid and exposure to the causative substance is permanently eliminated.

Excessive Licking or Biting

Excessive licking and biting indicate either local discomfort or a behavioral problem associated with stress or anxiety. Sometimes, a small initial lesion becomes extensive due to self-inflicted trauma, as the dog repeats the gestures until the inflammation worsens. Some breeds have a higher predisposition to developing these habits, and specialists believe that psychological factors also play an important role.

Poor Nutrition

Nutritional deficiencies are a major factor in the occurrence of dermatitis, especially when essential fatty acids, vitamins, and quality proteins are lacking in the diet. Dogs need specific amino acids for keratin synthesis, which ensures the strength and elasticity of the epidermis. A nutrient-poor diet weakens immunity, increasing vulnerability to infectious agents. Certain herbal supplements or natural extracts can contribute to the regeneration of damaged areas. Products available in veterinary pharmacies include specific formulas designed to balance the diet and prevent hair loss. The veterinarian sometimes recommends therapeutic diets, especially when there is a suspicion of allergic reactions.

Symptoms of Dog Skin Diseases

The signs and symptoms of a dog's skin disease vary depending on the etiology and can overlap when complications occur. Some conditions spread rapidly, and the lack of a correct diagnosis leads to a general deterioration of health. Main symptoms include:

• persistent itching, especially in the ears, paws, and armpits;
• hair loss in areas of varying sizes;
• presence of scabs, papules, or pustules on the skin;
• small bleeding or exuding areas, followed by the formation of hard scabs;
• unusual coat odor, associated with bacterial multiplication;
• skin color changes, such as hyperpigmentation or depigmentation;
• serous or purulent secretions in fissured areas;
• discomfort, restlessness, and insomnia in the dog due to intense itching.

When to take your dog to the vet

Any sudden change in the skin or coat, accompanied by pronounced itching, deserves immediate attention. Wet, red, and painful lesions suggest a severe infectious or inflammatory process. The appearance of fever, lethargy, or loss of appetite indicates a more serious problem that requires professional examination. If a dog scratches until bleeding or constantly chews its paws, medical intervention becomes a priority. Delaying investigations complicates treatment and favors complications through the spread of infections or infestations.

Treatment for Dog Skin Diseases

The therapeutic protocol varies depending on the triggering factor and the clinical stage. Bacterial infections respond to appropriate broad-spectrum antibiotics, administered locally or systemically. For parasites, acaricidal products, insecticides, or spot-on solutions are used. Autoimmune conditions require immunosuppressants and regular monitoring to control potential adverse reactions. Allergic dermatitis necessitates allergen avoidance and, sometimes, medications that reduce inflammation and itching. The veterinarian recommends antiseptic shampoos and soothing substances suitable for the skin type.

Natural treatments can supplement the main regimen by supporting skin function and their anti-inflammatory role. For example, supplements with Omega-3 fatty acids or plant extracts help regeneration. However, each case has its specificities, and self-medication risks worsening the situation. That is why a visit to the veterinarian is always recommended to avoid aggravating the condition. Adhering to the doses and duration of treatment ensures a favorable outcome.

Preventing Dog Skin Diseases

Just like humans, dogs can experience significant discomfort due to skin diseases. That is why preventing skin diseases in dogs is important for maintaining their health and overall well-being. A proactive approach can significantly reduce the risk of dermatological conditions.

Prevention strategies include:

- frequent brushing of the coat (helps remove dirt and external parasites, thus preventing skin irritations and infections);

- adopting a balanced diet (opt for products rich in protein, essential fatty acids, and vitamins);

- adapting the diet to meet the dog's individual needs (for example, if the dog has allergies, it is mandatory to choose special food for allergic dogs);

- periodic administration of antiparasitic products (prevents infestations with fleas, ticks, and mites, which can cause irritations and skin diseases in dogs);

- ensuring a clean, well-ventilated, and dry space (helps prevent the growth of fungi and bacteria that can affect the skin);

- stress reduction (chronic stress can weaken the immune system, increasing susceptibility to infections and skin inflammations);

- regular veterinary visits (allows for early detection of dermatological problems and prompt intervention);

- avoiding exposure to irritants (aggressive chemical products or toxic plants should be avoided, as well as potentially irritating grooming products).

Frequently asked questions about dog skin diseases

What should I do if my dog is excessively itchy?

Accentuated pruritus can signal various skin diseases in dogs, so if it occurs, it should prompt a visit to the veterinarian. During the consultation, the presence of fleas, ticks, or other parasites is checked, the dietary situation, the possibility of contact with irritants, and the medical history are analyzed. The specialist examines the skin, possibly collects samples, and establishes a differential diagnosis.

Are dog skin diseases contagious to humans?

Some canine conditions have zoonotic potential (transmission to humans), particularly those caused by certain mites or fungi. Fleas can bite humans, but the resulting inflammations are usually moderate. Dermatophytosis, a common skin infection, can be transmitted between species, including to humans, through direct contact or contaminated objects. For bacterial conditions, the risk of transmission to humans depends on the microorganism and the immunity of the exposed individual.

How can I tell if my dog has dermatitis?

Dermatitis is characterized by redness and flaking of the skin, as well as itching in the affected skin region. Sometimes, pustules or papules appear, and the dog shows discomfort by licking and scratching. The fur becomes sparse or areas of broken hair form, and lesions can ooze when bacterial infections set in. The smell of the skin changes, becoming more intense.

Why do eczema appear in dogs?

Eczema results from inflammatory reactions to external or internal stimuli, such as allergens, chemical irritants, parasites, or autoimmune factors. Inappropriate diet, with nutrient deficiencies, accentuates inflammation. Some breeds develop hereditary predispositions, and stress or certain metabolic diseases can amplify eczematous episodes. Eczema is recognized by red, itchy areas, which sometimes present exudate.

How often should I bathe my dog?

The frequency of baths depends on the type of coat, skin condition, and daily activity. Long-haired breeds prone to tangling may need monthly baths, while short-haired specimens can be bathed less frequently. Veterinarians recommend hypoallergenic shampoos when there is a history of skin diseases in dogs, to avoid further irritation of the epidermis.

Photo source: Freepik

Last updated: March 9, 2025

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