I'm taking Dale to puppy class and they require the puppies to wear a collar and leash. I'm concerned b/c Dale is really freaking out with when I try to walk him on a leash. When I try to tug him towards me he yelps and cries. I ended up buying a harness and that is working much better, but i'm just concerned that maybe something is going on with his neck. Anybody else have a similar issue?