I have a 9 1/2 yo Great Pyr. He is wonderful. I share him with my neighbor. I buy the food and feed him, I take him to the vet and pay the bill, and I walk him twice a day during the week. She has him in her 3br apt (I only have a small studio) and she walks him on weekends. My neighbor doesn't want the dog any more and resents having him in her apt and walking him. Now she claims he is urinating and defecating at home. During the week when I take him out he does not seem to have the problem. Is it a physical or emotional problem?