What Is Our Pit Bull Mixed With?

Beau, is 1 year old rescue. We can see the Pit in him, however we are torn with what he is mixed with. People ask all the time, and we wish we could answer them. I don't know why, but I was thinking he had some Lab in him, making him a "Pitabor". He can be energetic, he loves to run around at the dog park, but he can also be a bit of a couch potato too. He weighs about 50lbs. Thanks!

By Ryan W.