I once saw two dogs on a chain in the back of a pickup...it was at the local Petsmart; they had just been adopted. The driver hit a bump and one of the dogs flew out. The dog was still attached to the chain and was hanging out of the back on the tailgate. The idiot driver got out, put the dog back, and drove away. I was almost physically ill. I was pretty young when this happened, but I will never forget that poor dog hanging from the chain...