crossing a bull into a working earthdog line is usualy done to put some heart back into a line and if you need to do that maybe its the wrong line for you if they have lost heart i find the first crosses to be a bit big and bulky and lack in the nose department they can be handy at the end for drawing or sometimes when in a big spot and they just bump into the stuff have seen some russel cross bullls used in ireland but did lack nose crossed again to produce a 3-4 threw some decent pups a lot of working earthdog lines have got bull in there but this usualy goes back a fair way and the emphasiz