Maybe my Henry gets a buddy- how is everyone introducing dogs to each other?

When we adopted Dunham 11 years ago, he was 10 weeks old, we had a 4 year old Rotti/Lab female named Roxie and a 9 year old Lab/German shepherd female named Chelsea. My wife introduced the pup to Roxie first, she wanted nothing to do with him, growled at him and and ignored him. I brought Chelsea in, she was the alpha, and she immediately took him under her wing, shielded him from Roxie, and even growled at Roxie when she bared her teeth. Problem solved right there. Roxie learned to accept Dunham, though she would not interact with him much until he was about a year old. Chelsea would allow him to do almost anything to her, only giving him a little nip when he was too rambunctious or bit her. She had been accepted much the same way by the Malamute/German Shepherd female that I had when I found her abandoned as a 3 month old puppy.
Dunham learned so many things from her in the 5 years they had together before she crossed that bridge, and has passed much of that along to his "siblings" Charlie and Olive. He is the alpha now, and at 11 years old, is still very happy and healthy.
Last year we decided to add Olive to our home, and I took Dunham and Charlie to the SPCA to meet her. We introduce Dunham first, in a play area beside the shelter, he was interested in her, and she was eager to play, but she is far too fast for him to keep up for long. I brought Charlie in, and he was more than willing to run around chasing her, though he too is no match for her speedy nature, she can keep up with a greyhound.