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

What I have found very effective is to introduce them in a neutral location, and allow them to get used to each other first. Our dogs are very well socialized, they go to an off leash park several times a week, and generally get along with all other dogs with minimal problems. That's not to say that there are never issues, our 3 range in size from about 60 to 105 lbs, and 2 years to 11. They each learned their place in the hierarchy of the pack, and we rarely have had to step in, allowing them to sort things out between themselves. I have had multiple dogs for many years, and have generally done the same thing with all of them, I also fostered dogs for the local SPCA at one time, there have been some minor scraps over the years, but seldom anything needing veterinary attention.
Don't try to force your dog to accept another, or to share food or toys that they are very attached to.