
Hi Sarah, I can only tell you how i did it, when i brought my 8 week old puppy into the house,. We already had a 5 yr old boxerboy. Get someone other than your self to bring the puppy in for the first time , and let them introduce the puppy to your older dog, by letting him sniff the pup, then putting puppy onto the ground and let them have a good old sniff at each other, all the time talking to your old boy,and making sure he never feels left out. Dont worry to much if he gets a bit rough with pup, mine used to put his paw on the pup and flatten her to the ground, just pick puppy up till they carm down again.
I tend to treat it like when you bring a new baby into the house . always make sure at the older one gets the attention first, that way they wont get to jealous. soon they will be getting on like a house on fire.
I am so jealous of your new puppy i love rotties.
Good luck