If your dog loses hair around the eyes or experiences other symptoms such as a loss of appetite or fatigue, book an appointment to see your veterinarian as soon as possible. Bad odours, itching and skin lesions are other signs that your pet needs medical attention. Your vet will be able to determine the cause of your dog's hair loss by examining him and conducting some tests. It’s better to be safe than sorry when it comes to your beloved pooch, and hair loss often causes discomfort and pain in animals.