I was told Mastiff-Lab...
Not even close!
I found her living in the bramble bushes by my house after I noticed, what I thought, was a racoon getting into my other dogs food in the garage.
After trapping her and taking her into the local Humane Society, we found no chip, and numerous open wounds and owies on her (some thing(s) tried to eat her it seems). The guess was she was about 2 months old.
Got her patched up, brought her home, and now I have the weirdest looking raccoon I've ever seen.
...also... not a Mastiff-Lab. I think the Humane Society folks didn't know how to break it to me I had a Maligator on my hands (Well... Dutch Shep-Staffy).