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The Discovery
Apparently I had missed or ignored the warnings about Xylitol that have been circulating in the past few months. Fortunately, I actually read and paid attention to the notice I was forwarded the previous night. Had I not received that forwarded e-mail, I might not have given this episode another thought and it's very likely that my dog would have gotten very sick or worse. Instead, I called the Animal Care Center in Rohnert Park and was advised to bring all three dogs in immediately, which of course I did. We arrived just after 7:00pm. The Culprit/Victim
More importantly, Billy's blood glucose (BG) level had already dropped to 62, even though he was otherwise asymptomatic. Billy went on to astonish the hospital staff by happily lapping up 100ml of activated charcoal from a bowl - apparently, this is unheard of (most require force feeding with a tube) and further indicates his willingness to ingest just about anything (note to self...). By 11:00pm, his BG had recovered to 98, but we were advised to leave him for the night for additional blood sugar and ALT level monitoring to be sure there were no signs of liver failure. Turned out to be a good choice, because overnight his BG dropped back down to 57, at which point he was put on IV fluids and supplemental dextrose. And though his BG rose with that treatment, it continued to hover under 90 for a while, indicating that he was still in some trouble. At midnight, they discontinued the IV to see if he could sustain his BG through the night, which he did. After a final ALT test on Thursday morning, he was released to go home - 36 hours after admission. The Other Dogs Because we couldn't be sure Billy was the only victim, Jasmine and Zack were also subjected to the ignominy of "emesis induction", as it is euphemistically referred to on the invoice. Neither showed any obvious evidence of ingestion, but in the interest of safety (some might call it paranoia), we had their blood tested as well. Amazingly (because he is a well-established counter-surfer himself), Zack came up clean with a BG of 100 so he was released on the spot. But Miss Jasmine tested at 77, requring a follow-up test to be sure she hadn't also grabbed an opportunistic chew. She was released after a couple of hours when she held steady at 77, still on the low side of normal but at least she wasn't dropping. The next day I checked with her regular vet and learned that her BG was 81 just a few months ago, so no apparent cause for concern. What is Xylitol, and why are we just starting to hear about it? Xylitol is a sugar alcohol, or polyol. It is used as a sugar-substitute, most commonly in gum and candy, but showing up more and more in other sugar-free products. It isn't always well labeled, so you need to put on those reading glasses and read the fine print. Reports of Xylitol Toxicosis are fairly new, simply because Xylitol hadn't been used much in American products until about 2004. That's when Trident starting adding it to some of its gum, followed in 2006 by Wrigley's Orbit line. But more recently, it has started showing up in other products, like Flintstones vitamins and Jell-O. It has also been observed that Rescue Remedy pastilles (candies) now contain Xylitol. This recently caused a stir in the dog community because some dog owners give their dogs Rescue Remedy products, but the Pet liquid does NOT have Xylitol - just the human candies. We can expect to see more and more Xylitol in products, and not just for its sweetening properties. Apparently, it has been shown to provide oral health benefits because it starves the plaque-inducing bacteria and kills them. Because of this, it is starting to show up in toothpaste and other dental products. In fact, there is a company called Epic Dental that sells all sorts of Xylitol products, including a gum containing more than six times the amount of Xylitol as in Trident Original. They tout this as a good thing - I see it as lethal. What is it so dangerous to dogs?
What makes Xylitol worth every bit of fear is that it takes only a small amount to cause significant harm, even in big dogs, and the harm can quickly be irreversible or fatal. To quote the VP Client Information Sheet on Xylitol Toxicosis (referenced below): "The prognosis is good for uncomplicated hypoglycemia when treatment can be instituted promptly. Liver failure and bleeding disorders generally carry a poor prognosis. Dogs that develop stupor or coma have a grave prognosis." How much Xylitol is in what? It turns out that this is amazingly difficult to figure out. And because the effect on the dog is directly tied to the amount consumed relative to body weight, it is extremely important to know. Why is it so hard? Because the sugarless products that include Xylitol usually also include other sugar alcohols, with names like Sorbitol, Mannitol, Glycerol, Maltitol, and Other-things-ending-in-ol. Of these, the only one that is toxic to dogs is Xylitol. But in the Nutrition Facts on the label, they are all lumped together as "Sugar Alcohol" so that all you know is the total, not how much is actually contributed by Xylitol. Because of this ambiguity, unless you can find another source for the specific product in question (as I was able to do), the only choice is to assume the worst case - that the entire Sugar Alcohol content is due to Xylitol. Most gums that contain Xylitol have a total Sugar Alcohol content of about 1g per stick. We were lucky because I was able to find a reference for the exact Xylitol content of Trident Original, which was much less - 0.17g per stick. How much Xylitol does it take? Because the problem is relatively new, there isn't enough data to clearly establish the levels associated with toxicity. However, the best sources we found suggest that hypoglycemia occurs at 100mg/kg, and that liver problems may present at 500mg/kg. We were able to calculate that Billy had ingested about 150mg/kg, which is consistent with his presentation and progression. Here is the calculation we used: Amount of Xylitol per stick of Trident Original gum: 0.17g
(170 mg) How much Xylitol is in other brands? I found the Trident content on the Epic Dental site, in a table bragging about high-Xylitol levels in their gum (mentioned above) compared to other brands. Most of the other products listed are not mainstream, so I assume they are other oral health products, but they happened to mention Trident. I have found no references that give this level of detail on other products. I did manage to extrapolate the following from the various
Wrigley's pages (thanks to feedback from a reader): Lessons Learned Based on what I've learned, here are the
recommendations I'd like to share:
Conclusion
Xylitol poisoning happens quickly and unexpectedly - please be vigilant for the sake of your pack. Acknowledgements
References
Feedback Wow, I found this feedback in my mailbox. Unfortunately, she didn't include her e-mail or follow up so I don't know the outcome. 21 Jan 2009, from Jenn Last updated 11/07/2010 © Holly Newman 2000-2011. All rights reserved. 
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On Tuesday 12/2/08, I arrived home from work to find, amidst
other remnants of dog naughtiness on the bedroom floor, the remains
of what I knew had once been an unopened 18-pack of Trident Original gum
containing Xylitol. The
package had been on the top shelf of a bookcase, which meant that one of the
dogs had jumped up on a crate, and stood up on his/her hind legs to retrieve
the prize from the shelf. Also on that shelf was a small bowl of treats that
I keep handy for rewarding good behavior - no doubt that was the attraction,
and the pack of gum was just a bonus.
Since
Billy was the most likely culprit, he got treated first. His
stomach contents confirmed his guilt, containing gum wrappers and non-distinct
white blobs (presumably wads of gum). It seems that during his brief
bedroom raid, he also got a few other things, including a bright red nylon/velcro
collar wallet-like thing and what appeared to be a chunk of "skin" from a
plush toy. Dr. Olson pointed out that it was the most interesting puke he
had seen in a while.
In humans (and apparently in cats), Xylitol is absorbed slowly and thus is not toxic. In dogs, on the other hand
(and perhaps rabbits and ferrets as well), it is
absorbed extremely quickly. The immediate result is that it fools the
pancreas into releasing a huge spike of insulin, which is quickly
followed by a precipitous drop in blood sugar (acute hypoglycemia) since
there isn't really any surplus sugar for the insulin to work on. That's
what we saw in Billy and were concerned about in Jasmine. The next problem, which isn't quite as well understood,
is severe (and often fatal) liver toxicity and failure. There isn't
yet clear evidence of causation, and Dr. Olson suggested that
these cases may be due to late discovery and a progression
of the severe hypoglycemia rather than a direct connection to the Xylitol. Either way, it isn't good.
My story has a happy ending, which I attribute to awareness, early detection, and immediate response and intervention.
As I have already mentioned, the awareness and early detection were pure dumb luck. I expect Billy to live a long full life, as long as I do a
better job of protecting him from my treacherous environment. And I can assure you,
no more Xylitol-containing products will ever cross my threshold. Of
course, I can't control other places he might be, so I will still have
to pay close attention.
