ive had 4 bullxs and not one slow take bunnys for fun but what breed 3/8 5/8 and 1/2 cross after that reverse cross and thats when the pace gose down hill abit but not a runing dog its a unit for one job ...but if its just a bunny dog your after ........... it would not go down this line its awaste of adog that got alot to offer.....