Excessive self-licking and chewing can be caused by a medical issue. It can also be a behavioral problem, a classic example of an obsessive/compulsive disorder. Either way, it's annoying to the dog's human companion, and dangerous to the health of the dog. Here are tips for dealing with dogs who self-lick and chew excessively. To begin behavior modification, determine your dog's stressors and start eliminating them. Make a list of everything?you can think that is stresses your dog even just a little bit, even if the stressors don't seem directly related to the licking. Your list might include thunder, small children, dogs on television, cats, riding in cars, visits to the vet, shock collars, medical issues, and many more. Most owners can identify between 10 and 20 stressors for their dogs.