I have a going to be 6 year old yorksher terrier that is a great pet. She is thought to be fully potty trained, but latley she has been going in the house(just pee). Even when she been out over her normal amount of times she is going in the house. This is been going on for about a week now and im starting to get worried. It really isint much just a little pee, but still a nusense. She feels very bad about it after words and goes and lies down in her bed with her tail and ears down. Nothing seems to be diffrent about her she does not seem sick, she still is wanting to play all the time. Is this somthing to be worried about?