[Dr. Shon Thomson]

First video: Not enough information. It bothers me the dogs are so slow to want to play. However, if the camera person were a stranger or not their primary caretaker, then that would explain why it took so long for the animals to be roused into a playful mood. Most emotionally healthy Pit Bulls I've met are fast to play with their owners... and often strangers if they were socialized correctly.

Second video: Not enough information. It looks like the guy is choking the dog oor pulling the skin back so tightly it looks almost Chinese. The dog itself appears healthy. The person holding him could have just inadvertently have been doing something weird to him at the same time this was shot. It doesn't indicate abuse to me.