Instructions
Puppy Introductions
Introduce the dogs in a neutral area where the resident dogs will not feel territorial. Begin by having the dogs take a walk together, and don't allow them to interact much. Allow them to sniff after the puppy has relieved itself because this will give them information about the new dog. Allow the puppy to sniff after them, too.
Take the dogs to a large area such as park where they can interact. Have a friend help you introduce them, with slack leashes or off-leash. Leave the leashes on in case there is a fight. Start with one resident dog at a time so they don't gang up on the puppy. Begin with the most dog-friendly dog.
Pick up all the toys, bones and beds in the house so the resident dogs will not be territorial. Separate the dogs, either with a door or baby gate. Every few hours, rotate the dogs so they will have a chance to smell the new dog and get familiar with its scent. After a few days, if the dogs seem comfortable, you can allow them to interact with one another when you are present. Don't leave them alone together for the first few weeks.
Continue to walk them together each day and allow them to play on neutral ground, even while you are keeping them separate in the house. The more positive interactions they have, the higher the chance you will have for a successful addition.
Introducing a New Puppy to a Household of Dogs
Just as not all people become friends, not all dogs get along. An important consideration before bringing a new puppy into your home is how your resident dogs will adapt to this new addition. Not all older dogs want a puppy as a companion, so give your older dogs a place to escape the puppy. Regulate their playing for several weeks until the resident dogs have accepted the puppy as a part of their pack.