If I had received this response from the trainer, I think I would be quite annoyed by it. It is obvious that the person asked the trainer to receive advice - not just on whether a GSD would be a good choice but on what they should ask or look for if considering adopting a puppy. IMHO the trainer has provided absolutely no help or suggestions at all, they just pointed out that they see a lot more GSDs in growl classes than other breeds. Okay. That's not very helpful and doesn't tell a potential adopter what they should look for or ask for. As for the suggestion to get a Cockapoo, maybe it's an inside joke, but I would be annoyed with any dog professional who recommends a designer breed.