[Berit]

Shane, if you get a "feeling" that any adult dog isn't going to be good with your puppy, or is showing signs of hesitancy or fear [erect fur on back or neck] then IMMEDIATELY remove your puppy from the situation. Don't allow a trainer to bully you either into allowing fellow class dogs or puppies to meet yours if the other dog is out of control or shows lack of proper doggy etiquette. I concur that any adult male dog who'd attack a puppy is an abnormal dog with unsocialized temperament. Keep that dog away from yours from now on. Too often, we allow our own good manners to prevent us from reacting properly to an abusive situation, even with our dogs.

Beth