well maybe ya just needed a different one, all animals are a pain in the seat end when hormones are just starting, but if ya show em your the head duck you'll be better off, discourage the behaviors you don't want, but they are first line of defense and will lay down their lives to protect their hens from danger, so an introduction kinda might have helped with the dog. We didn't have the issue with the swedes cause got the drake as a baby with some chicks as he was all alone, and the dog was told to guard em so the drake was comfortable with him, not so much the neighbors dog that wanted to come visit though, the boxer took his job very seriously was worse than a mother hen with babies, checking on them every 5 minutes from before they got feathers. That drake was a pain when teenage hormones kicked in but dog settled him down real quick too with being so rough with the hens. Do you have a Pond or a pool for them? that makes that job lots easier with less injuries after watching that flock for 8 years