Its happening to me to, I really do think if your gonna have rough dogs they might as well fight the hog insteead of nipping at it. We have tried 1 dog up to four dogs, same results. They just run, but when I would take my 3 I had better results I have some rough dogs so that might be the difference. I think there is a difference between gritty and real rough, I could be wrong. I have some buddies say they have gritty dogs and the hogs break. I think my dogs try really hard to catch when they try to break and back off and bay when they stop. I don't think the nipping on the butt stops them trying to latch on the ear or huevos stops them, just my my experience.