I would introduce the puppy in a crate. Let the other dogs smell it while it is in the crate. After your dogs check it out, I would take all the dogs, including the puppy, for a walk before it comes in the house. And just be relaxed. Show your other dogs that you are happy to have a new puppy in the house, but do not be too excited. Your dogs will read off you and respond to how you act. Also, don't let the puppy have extra privileges/special treatment that the other dogs don't have because that will cause resentment, and your dogs may reject the puppy because of it. I hope this helps!