The whining is just excitement from seeing the hog. Most dogs that people call silent will do that. I have 2 that are silent but if they are seeing the hog right in front of them they will whine a little.. I've run a lot of silent dogs with open dogs and mine still didn't bark running. I'm sure it has an effect on some dogs but most of the time a dog is either open or silent no matter his company..
I agree with Matt.
Cutter Bay Kennels
Big Game Blueticks