Devocalization is a practice that involves removing a "large amount of laryngal (throat) tissue- Peta" from a dog so it will not be able to bark. The aftermath of this procedure is terrible painful. What is worse is that the dog loses its way of communicating. At first it is completely silent, but then scar tissue covers up the area and its bark becomes a raspy, low pitched squeal. How would you like it if you couldn't talk because somebody performed a painful surgery just because they don't like what your saying? This practice is so cruel that most vets will not perform it. It would be much better for your dog (and conscience) if you were to spend the time and effort into re-training your dog to vocalize its opinion properly.
This would make for a great persuasive a writing or research paper for all you students out there!
Read more at:
APDT (Association of Pet Dog Trainers)
AAHA (American Animal Hospital Association)
American Humane Association
New York Times
Human Society Veterinary Medical Association (PDF)
The opposing viewpoint:
NAIA (National Animal Intrest Alliance)- (in reference to breeders devocalizing their dogs)