Sometimes, abnormal bathroom behavior is just that, a behavioral problem.  Other times, urinating or defecating in abnormal places can be an indicator of a disease condition like kidney disease, diabetes, infection or urinary obstruction.  Serious conditions such as these need to be ruled out before a veterinarian would advise consulting with a behaviorist. The first step is call to consult with a veterinarian to describe what other abnormal signs you may be seeing that would indicate how urgently your pet should be evaluated.