As a long-time vet tech, I will tell you that I have seen more than a few Chows and Chow mixes bite their owners and threaten to bite their owners when trying to even mildly restrain them. I also had to assist in the euthanasia of a Chow (full blood) that had killed a three year old boy who walked too close to his food bowl. Having to handle a dog soaked in a baby's blood will tend to put you off a breed with good reason.