I was advised when I got Sully that it helps to start leash training in the house, and by doing so, it also helps your male puppy see YOU as the alpha dog....if that makes any sense.
I was told that for a little bit each day, put them on the leash and have them follow you around the house, as long as you enter thru doorways before your puppy does, etc. that way your dog sees you as boss!
Any other advice?