I never seen a good bull x myself and I been out with a fair few, once seen one run four fields back and hide under the van whilst my 20inch colliewhippetgrey was stuck head in getting banged up , on other nites different dogs couldn't pick up a cold couldn't turn they were all abit pointless in my opinion having relatives of mine owned a lot of deerx id take that breed far over any bullx that's my opinion each to there own