To me an allrounder is a dog that can do most aspects of hunting. If you get invited coursing, or a days ferreting, of a night on the lamp, you should be able to take the same dog. It's probably impossible to find one that excels at everything but most good dogs should have a go at most things. I personally like saluki types, as most dogs can learn to ferret and lamp but I believe stamina is in the genes regardless of how well you train it.