9. Any Behavior That Could be a Health Problem
Behavior problems and medical problems can be hard to distinguish and may also be related. A dog that used to be well housetrained may not just be regressing in his or her behavior. A pet that tries to bite during petting may do so because something hurts. And an obsessive licker can have an anxiety problem, a skin problem, or both.
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Get down to the underlying issue by visiting a veterinary behaviorist.