How does your dog get along with other pets in your home?

This is a very good question and I have an easy answer for you. The answer is: Bad, very bad. Duc, my yorkshire terrier is an adorable dog, though, he's only adorable to humans and female dogs. No matter what other animal you present him with, he'll try to kill it or at least bite it. I have a guinea pig in my room and I have to keep my door closed all the time. Whenever I leave it open or allow the dog in, he'll sit next to the pig's cage, looking at him. As soon as the pig comes out of his hidding place, the dog attacks the cage at full force and I have to take him outside of the room, else, he'd end up destroying it and doing whatever(I don't know what and I'm not really curious.) with the pig. This happens with other dogs in the street aswell. When I'm walking him, if I find another dog, no matter how tall it is, he'll try to attack it.