I've been breeding and training Rottweilers for the last 10 years so I have a lot of experience with BIG DOGS, but not with Corgis I'm afraid, I never even came across one back when I did handling trials.

Collies are lovely, but what about a Sheltie? They're a bit smaller than a Border collie, and I used to train and handle one and he was the nicest dog ever, and one of the best dogs I got to work with.

With collies and corgis you do need to take into account the grooming side of things.