the rabbit, find a dog breeder locally. Tell them that you want, say, a border collie without a tail, and they can probably breed you one by selection in about six generations.
Or maybe a rabbit breeder? It'd be quicker!
I bred sheep for a while. It was soon obvious how easy it is to breed resistance to worms. I'm sure that, if left to their own devices rather than being drenched all the time, a natural, evolved, worm free strain would soon triumph.
