Up to 3% of dogs have obsessive-compulsive disorder, an anxiety disorder seen more frequently in some purebred dogs and exacerbated by stress, writes veterinarian Francine Rattner. Dogs that exhibit behaviors such as tail chasing or constant licking may have the condition, although Dr. Rattner says it's important to have the animal evaluated to ensure there is not an underlying medical issue. Exercising the dog and removing the sources of stress may help, according to Dr. Rattner.

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