We have four helper dogs that all have different roles.
Papa 14 year old standard Aussie, is great with puppies, he is patient, but gives gentle corrections when needed. He is a great neutral dog for our reactive dogs.
Scooby 9 year old American Pitbull, is great with shy puppies who needs to build a confidence as he lets them get away with murder. A puppy can do no wrong, and he never corrects them, the wilder they are the better is his motto. He is a great neutral dog and greeter dog and teaches a lot of unsocialized teenage dogs how to play, and interact with his patient attitude.
Astrid 5 year old Mini Aussie, Astrid we break out for the rude puppies, puppies that has no boundaries or manners around other dogs. Astrid is a strict lady who does gentle but precise corrections.
Artemis 2 year old Border Collie, she is excellent with small and shy puppies, she has very gentle manners and a lot of patience. Her gentle coaxing and self handicapping gets a lot of puppy mill rescues out of their shells. She also works the rude puppies but is not as consistent in correcting them like Astrid is.