I appraised a house in Agawam years ago for an elderly couple that had over 50 cats. They both were old and in poor health and were both in the hospital for over a month. They had no one to take care of the cats so the cats were alone in the house for at least a month. Finally, the ASPCA or some other group found out about it and took the cats that were still alive to a shelter, there was a lot of cats that didn't make it. This house had a stink like you can't imagine, the cat pee bubbled up the Formica countertop and paint on the walls, the wood trim, baseboards, everything. A contractor bought the house for practically nothing and had to gut it and had to redo the whole interior. After he was done the smell was gone and it looked good.