Why Dogs Lose Hair in Spots

Hormonal Disease

Some dogs lose hair due to a hormonal disease called hyperadrenocortism. This hormonal disease can cause hair loss in dogs, as well as increased skin pigmentation. See your veterinarian, as they will be able to tell whether your dog's hair loss is a result of this hormonal disease or some other affliction.

Hair Loss Under Collar

Often times, your dog will lose hair under the collar simply because the hair gets tangled in the collar, and therefore pulled out. Other dogs, meanwhile, may be allergic to some of the materials in certain dog collars. Change collars as soon as you notice any redness, scabbing, or bleeding, and consult with your veterinarian if this condition persists under a new collar.

Bald Spots

Allergies or infections, such as ringworm, are common causes for small bald spots in dogs. Consult your veterinarian as soon as you notice these circular bald spots, as they are treatable. Dogs may also lose hair at the site of vaccination spots, though such occurrences are not all that common.

Seasonal Hair Loss and Allergies

If you notice hair loss at certain points in the year, particularly during allergy season, consult a veterinary dermatologist to attain more information and perhaps secure a prescription. Owners of younger dogs are often encouraged to have their dogs undergo hyposensitization, in which a veterinarian injects traces of those substances leading to allergies, thereby making the dog more immune to them.

Flea and Tick Infestation

Not only are fleas and ticks parasites, if left untreated, they can cause skin irritation, itching and hair loss in your dog. Treat your dog with a monthly flea/tick preventative, which are sold at any major retailer or pet store, to ensure the eradication of fleas and ticks. Also, bathe your dog regularly in flea/tick shampoo, particularly those dogs that live outside and are more exposed to fleas and ticks.

References

• Hair Loss Problems
• Dogs Losing Hair