[Lilymo]

I have 5 dogs three are adult and two puppy's. I have introduces new members into our pack at different ages. The dogs must know you are boss and you say who is invited in to your home,not them. That said it takes a firm no at the first hint of aggression from the older dog. And plenty praise when all is going well. There will be some period of adjustment as the pack order changes depending on the place the new dog takes. Just be aware at the beginning not to leave the pup alone with the older dOg until you are sure it has been accepted. For mine it took about a month before I was confident enough to leave them all alone together when I went out to hang washing etc. the main thing is not to be over protective of the puppy cause if you are nervous it passes to the dogs. They will accept each other in time.