We've caught plenty of decent size hogs 100 yards or so away from another bay. A solid bay with hogs squealing and dogs barking and they stayed put. I figure if a hog wants to run its gonna run regardless. A silent dog might get closer to it before it does but my opinion is its gonna run if it wants to either way.
lots of hogs lay low when one breaks and runs and the dogs go after it and catches it. you can come backand strike catch again from the ones that thought they were hid. I have seen this with open dogs.
The dogs can be silent and the hogs know you are coming with the dogs because they hear the rattling of the gate and the four wheelers firing up...they know the routine.