My Stumpy has trained all of our dogs. Sam and Spike were terrified of him when they were puppies - Stumpy wanted them to chill out and treat him with respect because he absolutely loves dogs. But he didn't want to deal with the rowdiness of puppies, so he showed them in no uncertain terms how they were to behave around him.
I've seen him do that with large full grown adult dogs when he first meets them. Yes, there were scars left more than once.