A friends 2 year old Bichon has been neutered, and totally house trained. When he spends a weekend with us, we also have a Papillon, he marks his spot quite a bit. What can I do to break him of this habit? I do take them outside a lot. He seems to always have a reserve!

Essentially you have a fire plug in the livingroom. You need to take the urine and odor out of this piece of furniture for this to no longer be a fire plug. Male dogs can somehow control their stream and pee as many times as they want. You need to keep him outside and revisit his favorite spots outside until you think he has no more pee in him. Male dogs can be infuriating with this behavior.