Eric, I was you two years ago, just let me give you my experience. I got my dog on craigslist ( I know...) but he was so damn cute, and the "breeder" said he was a pure bred English lab-which explained his blocky head. I got him when he was allegedly 8 weeks, but was probably no more than 6. Around three weeks later his facial features changed, more wrinkly, wider set eyes, and ears that would not sit down. I didn't really Care, even after other people would comment that he had some pit in him. What started to freak me out was the innate aggressive qualities, going after larger dogs, growling and showing his teeth when pissed off, and resource guarding. I socialized him like hell. Bought him shitloads of chew toys. But there was just something off. After about 3 months, he looked about 75 percent pit 25 percent lab. It was always the eyes that gave him away. So I tested him to know for sure, and the dna profiles only give general categories. Pits are bulldogs mixed with terriers, so you will probably end up with American bulldog and some lab based on how your dog looks, with probably terrier mix and chow thrown in. After I had him for a while the aggressiveness became more pronounced. I got concerned. I had a dog trainer who kept saying " oh this isn't good" anytime he'd demonstrate food or fear aggression. Then he nipped at my nieces foot, and it wasn't playful. He was tremendously muscular and athletic, and I didn't think my 6 foot fence would ultimately contain him. I looked up dogsbite.org and it opened my eyes. I was open minded, but data is data. Look at fatality numbers yearly for the past five years. Im not going to summarize it. Read it yourself. Here's the thing: if you are a super responsible owner, you will still have moments when you are fallible. Can you promise that the dog will never get out through an open gate, or that a child will never be alone with the dog, for even 10 seconds? I truly believe that alot of these dogs (pits and their mixes) are inherently aggressive and can snap with little more provocation than a child pulling their tail. The difference is when they attack, it is not to wound, but to immobilize and kill. I rehomed my dog through a great charity, full disclosure on my concerns, and have no regrets. A dog is a lot of responsibility. But with a pit or pit mix,there is no margin for error. Be careful, get him socialized, and really watch him behaviorally. Red flags tend to show up in the first 4-5 months. Even the mixes have these tendencies. Good luck! By the way read dogsbite.org about the psychology of the pitbull owner. It will make sense when you read the responses to my comments.