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Patchy hair loss (alopecia) in dogs is more than a cosmetic concern — it can signal an underlying issue that deserves attention. Here are 8 common causes and practical next steps.
Allergies are a common cause of hair loss in dogs. Environmental allergens (pollen, dust mites) or food sensitivities can trigger inflammation, scratching, licking, and hair loss — typically around the paws, ears, belly, and flanks.
Related reading: Dog Itchy Skin Home Remedies and Natural Allergy Relief for Dogs.
Mites that burrow into the skin cause intense itching and patchy hair loss. Demodectic mange often affects puppies and immunocompromised dogs; sarcoptic mange is highly contagious.
Hypothyroidism, Cushing's disease, and estrogen/testosterone imbalances cause symmetrical, non-itchy hair loss — often on the trunk, tail, and thighs.
Deficiencies in omega-3 fatty acids, zinc, biotin, and B-vitamins directly affect coat quality and can cause thinning and hair loss.
The gut-skin axis is well-documented in veterinary research. Dysbiosis may contribute to inflammatory patterns, allergic responses, and nutrient-absorption challenges that can affect coat quality. Learn more about The Link Between Gut Health and Skin Conditions in 2026.
Psychogenic alopecia from compulsive licking (acral lick dermatitis) typically affects the forelegs and can be difficult to resolve without addressing the root anxiety.
Conditions like pemphigus and lupus cause the immune system to attack hair follicles, resulting in crusting, ulceration, and hair loss.
Seek immediate vet care if hair loss is accompanied by open sores, foul odour, rapid spreading, lethargy, or changes in appetite or thirst.
Use this owner guide alongside the WSAVA Global Nutrition Guidelines and the advice of the veterinarian managing the individual animal.
Patchy hair loss can come from parasites, infection, allergy, hormonal disease, friction, or other causes. Because the treatments differ, persistent or spreading hair loss needs veterinary diagnosis rather than trial-and-error supplementation.
Allergies are a common cause of hair loss in dogs. Environmental allergens (pollen, dust mites) or food sensitivities can trigger inflammation, scratching, licking, and hair loss — typically around the paws, ears, belly, and flanks.
For Dog Losing Hair in Patches 8 Causes and How to Help, compare the dog's baseline, the exact goal, product or diet details, relevant health conditions, medications, and the evidence supporting the proposed change. Change one variable at a time so benefits or adverse effects can be interpreted.
For Dog Losing Hair in Patches 8 Causes and How to Help, track the dog's baseline, the one variable changed, appetite, stool, vomiting, comfort, energy, skin or coat signs when relevant, and any adverse effect. A dated record helps owners and veterinarians judge trends instead of isolated days.
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