Anna, have you ever seen "The Dog Whisperer"? It's on The National Geographic Channel every day at 6:30 PM, Eastern Time. It's a great program because it trains people on how to handle their dogs with consistent , gentle discipline. One of the things he insist on is that the collar should be placed right behind the ears, like in dog shows, not in the middle of the neck. This will keep the head up and stop the dog from doing goofy things like trying to get at the leash. Also, he'll tell you to make very sure you establish your "Alfa" position as soon as possible. His mantra is "discipline first."
This man has a dog psychology clinic in CA with a pack of 30 dogs he has adopted and rehabilitated from all kinds of problems.
Watch it if you can and good luck with baby Bon.