To me the bigger the better! I grew up on a farm with a St. Bernard so I'm definitely partial to them. I fear the little yip yaps, ankle biters. Nothing against them since I love ALL animals (and going back to school for vet asst.) but right now I work delivering pizza and THOSE are the one's we've gotten bit by the most. So far, knock wood, I've just been scratched a bit by them. I always have a pocket full of bones with me for those houses that have dogs. But as I said before, the bigger the better.