Bitches usually taller, but saying that some of mike browns stuff is very tall, too tall really it's getting away from everything that's good about a whippet, you might aswell look for a small Grey bitch, a small whippet bitch 18" will have prey drive through the roof and be as good on rats as terriers and the best on Bunnys, mine don't do jumping you could teach them but when it goes wrong it's a trip to the vets, better to just lift them over or lift bottom of fence and teach them too go under,