I have a 2 1/2 year old male Cavalier King Charles Spaniel. He has been housebroken since he was about a year old. Four months ago we got another Cavalier who is practically housebroken and has an accident a couple times a month now, but tells us when he needs to go out. Recently, our older dog has begun peeing and pooping in the house. The first time he peed he did it in one spot like he does outside, now he is walking and peeing. The only time he poops is when the younger one is around. At first I thought it ma have been a behavioral thing, but now I am not so sure. He is not fixed as we plan on breeding him. Do you have any advice? We have not taken him to the vet yet because it hasn't been happening all that much, but now I am concerned.