I have a pit and a golden retriever cross. My goldie is ancient (almost 15) and my pit is very good with her! In fact, if he does accidentally get a little rough, she growls and he goes belly up like a pup, even though he could easily hurt her. We’ve also dog sat for a border collie mix, a teacup chihuahua and a 9 week old lab puppy. Kaos played a little rough with the border collie, but that’s because she played rough back. We just kept an eye on them to make sure it didn’t get out of hand. I’m embarrassed to admit that the chihuahua, the puppy, the pekingese across the street, the chihuahua and the min pin across the street, as well as the dachsunds down the street all bully my bully. He RUNS, tail tucked from my mother-in-law’s 4 lb chihuahua (I would too, if I could!) What it all comes down to is the individual dog and how you raise them. Are there pits that are dog aggressive? YES!!!! But, that’s not a judgement of ALL pits, or even the majority. For the most part, if they are properly raised and socialized they are fantastic family dogs. If you get a puppy and teach him or her from the gate that you are boss and that the little ankle biter IS NOT a chew toy, you shouldn’t have problems. My advice would be to monitor them closely, because even accidents can be deadly, but as far as the pit being aggressive, or intentionally injuring the little one, you shouldn’t need to worry too much. Just keep in mind when you’re teaching your puppy, it’s looking to you to set the boundaries. If you allow the puppy to play rough with the other dog, he will play rough as a 60+ lb adult. If you teach him that rough play is unacceptable, he will respect that as an adult, too.