Hi I have a 3 year old jack russell. He has all of a sudden started peeing in my partners house. He is outside all day, comes in at night then he is let out before we go to bed to go toilet which he does. We have recently been waking up (about 6:30am) to finding that he has urinated and the other night he pooped. He only has done this at my partners house and he has never done this in anyone's house (eg, old flat, parents and did not do this with me and my ex partner when we lived together in a house). The other issue is that his whining has gotten EXTREMELY annoying and seems to be doing constantly, it seems he is always excited... also has never done this in the past.
PLEASE HELP!

Time to take him to a vet. We can't diagnose on the Internet. First, rule out a physical problem.