Really! Now then that being said, the lab mix could have some pit in him, maybe giving the dog a simmilar shape head. Pit Bulls, American Stafordshire Terriers, do not get up to a hundred pounds.
Huh? I have seen pits that size. I would trust animal control over the police in IDing the dog.
Some other freeper posted an article a month or so ago about a breeder that had pits starting at 100 pounds to 150 adult weight. I followed the link to read about them, but alas, I forgot to write down the name of the breeder and his web site....lots of pits go over 50 pounds...