For some reason he started to become more and more aggressive as in it seemed like he wasn't just playing anymore. He would bite harder and keep assaulting like he wanted revenge. But we're all big guys so it was ok with us. I guess the new guy wasn't use to it.
I say american pit bull terrier and smooth collie. His nose is too long to be from pit bull or basenji. He coat is also too long. I think he is a bit too big to be half basenji also.