Hello! I'm new to this website and I don't know if I can post this, but my 11 year old chihuahua Lewis is usually pretty friendly and is generally a happy dog, but over the last 2-3 days I've noticed he's been acting really strange. Usually he likes hanging out on my bed or on the couch but in the past few days he's been sitting in the corner of the kitchen and climbing into my wardrobe and just hiding in weird places. We recently got a new cat but I don't think that has anything to do with it because he likes cats and they get along well. If someone could please give me suggestions as to what is wrong that would be great!!