Some of my past catch dogs.

We like the big dogs because out in the marsh, they not only anchor the hog, there is not much to tie a dog up to. It really does not matter tho because whatever size dog catches the hog, The Plotts have him covered. In fact, depending on how many we have out, most of the time we are going to a caught hog. A smaller dog might be a hair faster but say in a hundred yard race if the smaller dog beats the bigger dog by 10 yards, dont really know if that makes a difference. I used to have a 45# pit and she caught everything but you did have to be carefull because a hog could walk and still charge you with her attached. She ended up getting killed by a big boar because he was slinging her everywhere and she just took to much of a beating. Anyway, no matter the size, the bite is what is important. If bulldogs are being shook off, they clearly do not have the bite.