I'd like to ask if the aggression test I'll describe is generally thought to be valid and safe. My daughter and I were walking our 2 dogs on privately owned property near a river which the owner opens to the public and allows dogs. A man in a truck with a dog walking beside rolled up to us, quickly exited and walked towards us. Without identifying himself (we later discovered he was the owner), he snatched the leash from my daughter's hand, walked away a couple of yards, and then returned the dog, while stating he's a trainer and was testing the dog for aggression. The dog is a gentle pit bull and didn't notice that she was snatched, being focused on looking at his dog. Is this something a trainer would really do? Another woman reports that her dog was so terrified it slipped its collar and ran. This place is near a main road. Am I right in thinking this is unsafe for the dog? He didn't test the dog I was holding, an American Eskimo, because he's clearly old, but very protective of me. I think he would've gotten bit. But he claims this is a standard approved test. It was a bit terrifying for us for a minute. Am I making too much of this?