[Breeds] Breed Guesses

I got him off craigslist about a month ago, he is 9 weeks now. The person who gave him to me said one parent was pure Australian shepherd and the other was pure border collie. However, I dont believe this is true and even the vet says he doesn't see that. Here are some photos of him http://imgur.com/a/3FJtJ Also feel free to ask personality questions if you think it will help