Looks like a medium sized dog, also looks young. I bet he's got a lot of energy & brain just waiting to be used!

I see BC on him for sure, I don't really see too much of anything else in him. Maybe a little spaniel or something. Its hard to tell from that pic. I also doubt that he's got toller in him, maybe but like mentioned above they are not too popular.

Sorry to hear your moms not to keen about the subject now. Just keep showing her how resposible you are & when the time is right for everyone you will have your new family member!