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Devocalization (also known as ventriculocordectomy or vocal cordectomy, and when performed on dogs may euphemistically be called debarking or bark softening) is a surgical procedure applied to dogs and cats, where tissue is removed from the animal’s vocal cords in order to permanently reduce the volume of their vocalizations. The procedure is outlawed as a form of mutilation in the United Kingdom and all countries that have signed the European Convention for the Protection of Pet Animals. In the United States, devocalization is illegal in Massachusetts, New Jersey, and Warwick, Rhode Island. Efforts to ban devocalization are underway in other states.
The procedure may be performed via the animal's mouth, with a portion of the vocal folds removed using a biopsy punch, cautery tool, scissor, or laser. The procedure may also be performed via an incision in the throat and through the larynx, which is a more invasive technique. All devocalization procedures require general anesthesia. Risks and side effects include negative reaction to anaesthesia, infection, bleeding, and pain. There is also the risk of the removed tissue growing back, or of scar tissue blocking the throat, both requiring further surgeries, though with the incisional technique, the risk of fibrosis is virtually eliminated. Most devocalized dogs have a subdued "husky" bark, audible up to 20 metres.
Chronic, excessive vocalization may be due to improper socialization or training, stress, boredom, fear, or frustration. Up to 35% of dog owners report problems with barking, which can cause disputes and legal problems. The practice is more common among some breeds of dog, such as the Shetland Sheepdog (or "Sheltie"), which are known as loud barkers (due to the nature of the environment in which the breed was developed).
The NCPPSP's Shelter Statistics Survey collected data from over 5,000 shelters, The study concluded that neither excessive vocalization nor general "behavior problems" were among the top ten reasons companion animals are relinquished at shelters.
In a study of 12 shelters reporting behaviors of animals relinquished to shelters as reported by prior caretakers, a majority of relinquished cats and dogs were reported to have "rarely or never" been too noisy.
|Was too noisy||Dogs||Cats|
|Always||99||5.0 %||31||2.4 %|
|Mostly||179||9.1 %||67||5.2 %|
|Sometimes||575||29.2 %||242||18.7 %|
|Rarely/never||1,119||56.7 %||951||73.7 %|
|The neutrality of this section is disputed. (May 2011)|
Dr. Kathy Gaughan, assistant professor of clinical sciences at Kansas State University's Veterinary Medical Teaching Hospital, points out that "the surgery stops the barking, but it doesn't address why the dog was barking in the first place." Gaughan notes that visitors to her clinic who request debarking are usually looking for a "quick fix". Gaughan states that, commonly, those who seek debarking live in apartments, or have neighbors who complain. Gaughan also counts "breeders with many dogs" among those who most often seek convenience devocalization. However, Dr. Gaughan does not agree with those who claim the procedure is cruel, stating "Recently, some animal advocates have asserted this surgery is cruel to the animal; some countries have even outlawed the procedure. I do not believe the surgical procedure is cruel; however, failing to address the underlying factors is inappropriate." 
Some breeders seek the surgery in order to limit or diminish noise levels for personal reasons ranging from convenience to prevention; some breeders even seek the surgery for puppies prior to going to new homes.
The subject of convenience devocalization is controversial.
Multiple animal medicine and animal welfare organizations discourage the use of convenience devocalization, recommending that it only be used as a last resort. However, organizations such as the American Veterinary Medical Association, American Animal Hospital Association and the American Society for the Prevention of Cruelty to Animals, oppose laws that would make devocalization illegal.
The American Veterinary Medical Association's official position states that "canine devocalization should only be performed by qualified, licensed veterinarians as a final alternative after behavioral modification efforts to correct excessive vocalization have failed." 
The American Society for the Prevention of Cruelty to Animals (ASPCA) recommends that animal caretakers first attempt to address animal behavior problems with humane behavior modification techniques and/or with a treatment protocol set up by an animal behavior specialist. The ASPCA recommends surgery only if behavior modification techniques have failed, and the animal is at risk of losing its home or its life.
The legality of convenience devocalization varies by jurisdiction.
In the United States, laws vary by state. In the year 2000, anti-debarking legislation was proposed in California, New Jersey, and Ohio. The California and New Jersey bills failed, partially due to opposition from groups who predicted the ban would lead to similar bans on ear cropping and other controversial cosmetic surgical procedures on dogs. The Ohio bill survived, and was signed into law by Governor Robert Taft in August 2000. However, Ohio Revised Code 955.22 only outlawed debarking of dogs considered "vicious".
In February 2009, 15-year-old Jordan Star of Needham, Massachusetts, filed a bill to outlaw performing convenience devocalization procedures upon cats and dogs. The bill is co-sponsored by Senator Scott Brown, with the title Logan's Law, after a debarked sheepdog. Star said of convenience devocalization: "To take a voice away from an animal is morally wrong." The bill became state law on April 23, 2010.
Devocalizing cats and dogs became illegal in Massachusetts by state law in 2010 and in Warwick, Rhode Island, by city ordinance in 2011. Legislation to ban devocalization of dogs and cats in New York State is underway.
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