Our other 2 dogs are doing fine with the puppy. Benji our Golden Retriever wants to play with him. Shadow our other Sheltie stays back a bit and just watches, however none of the 2 dogs show any type of aggression.
The puppy is doing pretty well on the house training. He whines, I put him on the leash (yes he learned to be on the leash), we go outside and he does his business. I think this is a great start.