Shane, if you are going in after the dogs with a knife, I am going to assume you are using bull dogs. I normally use a ,44 mag pistol and I hunt behind dogs also. I use airedales and they catch and the whole work but if I touch the hog they release and grab the hog where my hand is and, in the action, they do get my hand on occasion so I don't do it anymore. I am usually in the middle of the fracas and I have seen what a wounded hog can do to close working dogs in heavy brush. I have also had the hogs rub the dogs off on the brush and were in my lap in the blink of an eye. To old and to slow.....or is it old enough to have gotten smart? Either way, I have killed hogs with .06's, 7/08, 22mags, 22 hornets, 30/30's and about a dozen other rounds. I like the pistols. but, I love the big bores like the 45/70. No one really need the long range rounds for hogs, Heck, ya can just about walk up on em if you can find em.