My 1 1/2 yr. old,deaf Jack Russell Terrier recently started looking up at the ceiling and trying to jump up and bite at something. She is also trying to climb the walls. It started out with her seeing a light reflection on the wall and ceiling but now she won't stop. This has gone on for over a week now. She also has started to urinate inside the house which she has not done since she was a puppy. Any explanations for this behavior or what I should do?