I am quite overwhelmed by the response to my question and I truly appreciate all of the input!!
I live in southern New Jersey and although I have several friends with dogs, I don't know any other collie owners except for the "backyard breeder" we got the pup from and I wouldn't seek him out at this point for much of anything. Colt does really well with other dogs and this issue is not a problem - I don't think I have EVER seen him bite another dog!~! I also don't believe this is "bad breeding" because he has so many great qualities. Also he is not fearful of strangers and is quite friendly but he has never even nipped at a person on a walk or anything.
I have had difficulty finding a puppy kindergarten class so far that works with my schedule as I need a weekDAY class. I have three kids and the evening classes just don't fit into the schedule.
Colt lost four teeth over the last two days - he is in pain and I am attributing some of his behavior to this as well as entering adolescence. I plan to get to the store this weekend and look for some freezable toys. The frozen washcloth thing didn't fly - no interest there he much prefers my hands and clothes and has taken to chewing on his crate when he is not in it!! A book I have mentioned frozen carrots - is this safe?
I have never trained a dog before but I KNOW IN MY HEART that this breed is not aggressive and that Colt will most likely grow out of this soon. He is a very headstrong little pup. Which brings me to my next question - how big should he be at 4 months? He only weighs about 12 -13 lbs. The vet says he is healthy but he seems way small to me (looks like a true "mini collie" if there were such a thing).
If anyone knows of a reputable collie breeder near Atlantic City or Ocean City, NJ please let me know.