JOEB... A dog will never be ruined by entering it too late. Its spring now mate, let your pup fill out and strengthen its muscles and bones. EASY kills and confidence is what its all about. IMHO your bitch would be best not to be run until july time. plenty of dumb, young rabbits around then mate and your dumb.,young dog will just whip them up i have walked in your shoes when i was younger mate, so i know what its like to be a little impatient, luckily i never ruined a dog, but it is so easy to make them open up mate. ...look at the bigger picture, in the grand scale of things theres no rush