Autoimmune Diseases in Dogs: Types, Diagnosis, and Treatment

What are autoimmune diseases in dogs?

Autoimmune diseases occur when the immune system loses its self-tolerance and attacks the body’s own tissues, cells, or proteins. In dogs, there is a wide range of autoimmune-mediated diseases—affecting everything from the skin and blood to the joints and the neuromuscular junction. What they all have in common is the underlying mechanism: the immune system produces autoantibodies or activates T cells against the body’s own structures, leading to chronic inflammation and organ damage.

Autoimmune diseases are difficult to diagnose and usually require long-term immunosuppressive therapy. Infectious or neoplastic causes must be ruled out before a diagnosis is made.

Background + Scientific Context

Olivry (2018, BMC Veterinary Research, PubMed 29751810) presents a systematic reclassification of autoimmune-mediated skin diseases in animals and reclassifies historical definitions according to modern immunological criteria. Pemphigus foliaceus (PF) is the most common autoimmune skin disease in dogs: IgG autoantibodies target desmoglein-1 (Dsg1) on keratinocytes, leading to the detachment of skin layers (acantholysis). Jordan and Bizikova (2025, Veterinary Clinics of North America, PubMed 39725576) provide an update on pathogenesis and therapy: pemphigus foliaceus remains one of the most common clinical challenges in veterinary dermatology.

Ravicini et al. (2023, Journal of Small Animal Practice, PubMed 36321528) described 73 dogs with primary immune-mediated polyarthritis: 95% responded to immunosuppression; 63% achieved complete remission without further treatment. The disease mortality rate was 19%—mostly due to complications of the underlying disease or side effects of treatment.

Vitomalia-Position

Autoimmune diseases in dogs are often diagnosed too late because they present with nonspecific symptoms (lameness, skin lesions, weakness) that resemble those of other conditions. We emphasize: Any suspicion of an autoimmune disease should be referred to a specialized veterinarian—diagnosis by process of elimination and specific testing requires clinical experience. Self-treatment with anti-inflammatory drugs delays diagnosis.

When do autoimmune diseases become a concern in dogs?

• If skin changes (scabs, pustules, erosions) appear, especially on the bridge of the nose, ears, and paw pads—typical of pemphigus
• In cases of recurrent anemia with no identifiable source of bleeding (IMHA)
• In cases of symmetrical lameness and joint swelling without trauma
• Changes in blood counts: thrombocytopenia (IMT), anemia (IMHA), elevated inflammatory markers
• As part of the differential diagnosis for infectious diseases: Lyme disease, leishmaniasis, and ehrlichiosis can produce autoimmune-like findings

Practical application

An overview of common autoimmune diseases in dogs:

Illness	Affected tissue	leading symptom	Frequency
DESTROY	Red blood cells	Pale mucous membranes, weakness	Frequently
International Monetary Trust	platelets	Petechiae, tendency to bleed	Frequently
Pemphigus foliaceus	skin surface	Scabs/pustules on the bridge of the nose and ears	Most Common Autoimmune Diseases
Immune-mediated polyarthritis	Joints	Lameness, fever, stiffness	Medium
Systemic lupus erythematosus (SLE)	Systemic (involving multiple organs)	Variable multi-organ signs	Rare
Myasthenia gravis	Neuromuscular connection	Muscle weakness, megaesophagus	Rare

Diagnostic pathway:

1. Exclusion of infectious causes (serology: Lyme disease, ehrlichiosis, leishmaniasis)
2. Complete blood count + biochemistry + urinalysis (organ involvement?)
3. Specific tests: Coombs test (IMHA), ANA test (lupus), biopsy (pemphigus, polyarthritis)
4. Synovial fluid analysis in cases of suspected polyarthritis
5. EMG + Antibodies against the acetylcholine receptor (myasthenia gravis)

Treatment:

Immunosuppression as the basic principle—typically prednisolone (1–2 mg/kg/day) as first-line therapy, followed by dose reduction upon response. Azathioprine, cyclosporine, or mycophenolate mofetil as adjunctive therapy in cases of inadequate response or intolerable side effects. Long-term monitoring is required.

Common Mistakes & Myths

• “The dog just has an allergy.” Pemphigus foliaceus is often mistaken for an allergy or dermatitis—the scabs on the bridge of the nose are not a sign of an allergic reaction. A biopsy will confirm the diagnosis.
• “Cortisone resolves all immune system problems.” Cortisone is important, but high long-term doses have significant side effects (Cushing’s syndrome, diabetes mellitus, gastrointestinal ulcers). Combination therapy allows for a faster reduction in dosage.
• “An autoimmune disease is incurable.” Partially incorrect: Immune-mediated polyarthritis goes into complete remission in 63% of dogs without further treatment. In many dogs, IMHA does not recur after successful treatment.

Current State of Research (2026)

The classification of autoimmune diseases in dogs is increasingly being differentiated based on molecular targets (Dsg1/Dsg3 in pemphigus, various ANA patterns in lupus). New biologics (JAK inhibitors, IL antibodies) are being researched for more severe or steroid-resistant cases. The distinction between immune-mediated and allergic diseases (e.g., atopy vs. pemphigus) is becoming increasingly clear both clinically and pathophysiologically.

Frequently Asked Questions

How can I tell if my dog has an autoimmune disease?

Depending on the type, autoimmune diseases present with a wide variety of symptoms: scabs and pustules on the bridge of the nose and ears (pemphigus), pale mucous membranes and weakness (IMHA), lameness and fever without evidence of infection (polyarthritis). Nonspecific symptoms such as lethargy and loss of appetite may also be present.

Can autoimmune diseases in dogs be cured?

Depending on the form: Immune-mediated polyarthritis achieves complete remission in 63% of cases. IMHA can go into permanent remission following treatment. Pemphigus foliaceus often requires long-term therapy. Lupus (SLE) is usually chronic but manageable.

How are autoimmune diseases treated in dogs?

The mainstay of treatment is immunosuppression—usually prednisolone as first-line therapy, supplemented by azathioprine, cyclosporine, or mycophenolate mofetil as needed. Long-term monitoring is required. The duration and regimen of treatment depend on the specific condition and the patient’s response.

Related terms

• Anemia in Dogs
• Atopic Dermatitis in Dogs
• Complete Blood Count for Dogs
• Symptom: Dog
• Infectious Diseases in Dogs
• Anaplasmosis in Dogs

Sources & Further Reading

1. Olivry, T. (2018). Auto-immune skin diseases in animals: time to reclassify and review after 40 years. BMC Veterinary Research, 14(1), 157. https://pubmed.ncbi.nlm.nih.gov/29751810/

2. Jordan, T. J. M., & Bizikova, P. (2025). Canine and feline pemphigus foliaceus — an update on pathogenesis and treatment. Veterinary Clinics of North America: Small Animal Practice, 55(2), 321–336. https://pubmed.ncbi.nlm.nih.gov/39725576/

3. Ravicini, S., Kent, A., Dunning, M., Baines, S., Clarke, S., & Allerton, F. (2023). Description and outcome of dogs with primary immune-mediated polyarthritis: 73 cases (2012–2017). Journal of Small Animal Practice, 64(3), 142–148. https://pubmed.ncbi.nlm.nih.gov/36321528/