If you want the dog on the ear break him off and put him on the ear for a while. Let him feel how it feels to handle the hog by the ear. The few bulldogs i have fooled with caught where ever however the first few times. Once i put them on the ear a couple times they are straight ear. Now on a small hog they will usually grab the top of the neck.
x2...I have heard that the first time the bull dog catches to guide him to the ear...it seems to have worked for me in the past...but the pit might have been an ear dog anyways but don't know for sure...