1. Allergies: The number one cause of hair loss in dogs is allergies. Sometimes allergies are triggered by the environment (mold, pollen, etc.), other times allergies can be attributed parasites like fleas or mites. An allergic reaction typically triggers itchy skin, which results in scratching, biting, and hair loss.
2. Ringworm or other bacterial/fungal infections: Ringworm, which is actually a type of fungus, typically causes skin inflammation, irritation, infection, and hair loss.
3. Parasite infestation: Fleas, ticks, and mites can all cause a dog’s skin to become itchy and inflamed, often leading to hair loss. Protect your dog with a parasite prevention product.
4. Cushing’s Disease: Cushing’s disease, or hyperadrenocorticism, occurs when the body produces too much of the hormone cortisol. Symptoms of Cushing’s disease include hair loss, skin darkening, and a pot-bellied abdomen.
5. Genetics: Some dog breeds, like the Chihuahua, Doberman Pinscher, Whippet, and Dachshund, are simply more susceptible to pattern baldness. The most common spots for baldness include the outer ears, back, thighs, chest, and neck.