Rabbits who suddenly stop using their litter box may seem "naughty," but this is often the first sign of subluxated lumbar vertebrae or bladder sludge —both painful conditions requiring radiographs and anti-inflammatories.

When a behavioral issue is strictly psychological, a structured treatment plan is required.

Veterinary behaviorists diagnose and treat complex psychological conditions that go beyond standard obedience issues. Canine Separation Anxiety