I dunno he's a mystery....He herds chickens like a cattle dog, has the fur texture of a chow, low key energy, only weighs 49.2 at 9 months, loves water like a lab, has an overbite like a boxer or bulldog, it's hard to tell for me because his previous "owners" decided to wrap a rubberband around his tail and docked it in half poor dog has so many scars on his legs.
I think those are a rip off, I can't imagine they'd tell you any more than what we've told you. Just think about human DNA, no send-in blood is gonna tell you ANYTHING about the person (besides VERY generic ethnicity) or where they came from.
I think alot of vets will just throw out Pit as the possible mix...I would guess chow/lab mix. Poor thing sounds terribly abused!! Good thing he's found a new home with you! Mutts can carry the best traits of what they're mixed with..I sometimes think my mutts smarter than my purebreds!! lol!! I'd never part with her!