About 3 or 4 days ago my dog was making more of a fuss than usual. He's a Siberian Husky, so we only worry about the weather bothering him when it's raining or snowing. 2 days ago he smelled awful, and I noticed his collar was a lot lower than usual. When we checked to see what the smell was, and I noticed the prongs to his shock collar had dug into his neck. I was worried enough when he tripped on the ice real bad a few years back, and his leg is only fully recovered now. He must have squeezed his way through a tight place, and forced the prongs down his neck. It was infected but with some ointment it will be fine now. The shock collar is needed for my Invisible fence which keeps the dog from running off, but what can I do to prevent this from happening again?