It wont cause any hassle above ground and below ground. Poachers used to hate it for obvious reasons. The yappers will still catch rabbits for certain, and they may be the best dogs a person ever owned, every dog has faults, mine have a lot like myself.
Do people think that the yappers would catch the same if they stopped blowing there lungs out yapping whilst running, rather than shutting there vocal chords and using the in short supply oxygen to fuel their tiring muscles?
Just my thoughts, I know our dogs need every bit they of air they can get, rather than waste it shouting at a rabbit ge