Personally on the small fields, hills and rough I work i would always prefer a dog between 22-24" TTS. I have no doubt that the bigger dogs with the drive/desire can be great, but I have seen them struggle on small quarry, over shooting and quite simply physically too big for the job in hand. I have owned 27" a dog which worked very hard for me for 6 seasons but I came to the conclusion that he was not suited to the game, although a dog with more drive, speed and a serpent like strike I have yet to see. I have ran a pure deerhound on rabbits, and it was quite amusing but not ideal. A big dog