Have trained a few rabbit dogs. I prefer snowshoe hare... go out with the dog in the morning after a night-time snow, and follow the tracks. Eventually you will see one sitting under a conifer. Call the dog, then when the dog gets close, head-shot the hare. After the dog runs in and shakes the hare, blood everywhere, hold the hare, and let the beagle lick the blood and sniff the feet. At that point the training is complete. Praise the dog, put the hare in the pack, and within 2 minutes that beagle will be hunting hares by track.