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Q & A about health, veterinary
matters, training, and life
Q: Dear Ginny,
I have heard rumors that there have been some problems with a dental chew bone that goes by the name of Greenies. What are these problems and are they true or just an exaggeration?
A: There is truth to at least one of these rumors--that there are cases where a Greenie, or a piece of it, has caused an obstruction of the esophagus, which is the tube that takes food from the throat to the stomach. An article in the April 1, 2008, issue of the Journal of the American Veterinary Medical Association (JAVMA) described "Esophageal foreign body obstruction caused by a dental chew treat in 31 dogs (2000-2006)."[1] This article evaluated 30 cases between March 2003 and January 2006, and one case from July 2000. All were evaluated either at a university teaching hospital or a private specialty hospital. Each dog included in this retrospective study had been given the treat shortly before onset of clinical signs and a green object was identified during endoscopy or surgery. All but four of the dogs were small dogs. In all but one of the 31 dogs, there was moderate to severe damage to the esophagus. Five dogs required surgery to open the chest. Complications of the esophageal damage were seen up to 25 days after diagnosis. Of the 31 dogs treated, only 15 dogs recovered without major complications. Six of the 31 dogs (or 25.8%) died or were euthanized as a direct result of the esophageal obstruction caused by the chew treat.
Certainly Greenies[2] are not the only treat, chew toy, or other material, that can cause damage or obstruction to the esophagus in dogs (or cats). The JAVMA article states that "Bones are the most common esophageal foreign bodies that have been reported in dogs, although fish-hooks, rawhide, pieces of plastic or metal, and other miscellaneous objects have been described. Small breeds of dogs are often affected. Common clinical signs include regurgitation [3] or vomiting, anorexia [or loss of appetite], salivation, and signs of depression [or listlessness]. Esophageal obstructive foreign bodies, such as bones, most commonly lodge in the distal portion of the esophagus [closest to the stomach], whereas the second most common location is at the level of the heart base. Diagnosis is usually made via ... radiography." The article goes on to say that, in 2004, Greenies "received the seal of acceptance for plaque and tartar removal from the Veterinar Oral Health Council of the American Veterinary Dental College." The Greenies web site reported sales over over 300 million of the chew treats in 2005, but,in June 2005, a group discussion sponsored by the Comparative Gastroenterology Society at the Medical Forum of the ACVIM [American College of Veterinary Internal Medicine] decribed difficulty in removing the esophageal obstructions caused by the dental treats, so further investigation was pursued.
It would seem logical that ANY hard chew treat that could break off pieces are large enough to get stuck in the esophagus, especially if they have corners or sharp edges, should not be given to dogs to chew on. One suggestion is to do some on-line investigation of a treat before you give it to your dog, regardless of how wonderful a manufacturer makes it sound.
[1] "Esophageal foreign body obstruction caused by a dental chew treat in 31 dogs (200-2006)," Michael S. Leib, DVM, MS DACVIM, and Laura Lee Sartor, DVM, DACVIM; published in JAVMA, Vol 232, No. 7, April 1, 2008, p.1021
[2] Greenies, S&M NuTec LLC, North Kansas City, Mo.
[3] "Regurgitation" = passive expulsion of ingested material from the mouth. It differs from vomiting, in that vomiting is an active process.
[Disclaimer: Any advice (or implied advice) found on this blog is no substitute for the clinical relationship that your pet has with his/her own veterinarian. You should ALWAYS seek the advice of your veterinarian before making any decisions about the health care of your pet.]
