Aug 5, - Allergies – A dog may lick their skin because it itches from allergies 2. A pet is a member of the family and as pet parents we take their health. Jan 5, - From a possible medical (or behavior) issue. Dogs that repeatedly lick a certain spot might be suffering from an issue that needs a specialist's intervention, including anxiety or obsessive-compulsive disorder. Also, dogs who frequently lick their feet may be trying to resolve a persistent itch caused by allergies.