Episode 26  ·  13m 09s

The Toy-Breed Puppy Emergency Most New Owners Never Hear About

Dr. Michael LoSasso, DVM & Julie Schwenzer Frisco Emergency Pet Care
Hypoglycemia Toy breed puppies Xylitol First aid Emergency signs
"A sudden drop in blood sugar can turn a normal day into a life-threatening crisis, but fast action can save a pet's life."
— Julie Schwenzer

Episode summary

For most adult dogs, blood sugar just isn't something owners need to think about. But for very young toy-breed puppies — Yorkies, Chihuahuas, Schnauzers, Dachshunds — Dr. LoSasso says it's a genuine and fast-moving risk. These puppies simply haven't developed glycemic stores yet, so unlike an adult dog that can coast on reserves for a while, they're entirely dependent on regular eating to keep their blood sugar up. The brain is the one organ that draws energy directly from the bloodstream rather than through insulin, which is exactly why a crashing blood sugar hits it first and hardest.

Anything that cuts into a puppy's appetite can tip this over: internal parasites, parvovirus, an upper respiratory infection, the stress of a recent move from breeder to new home, a food change, or simply too much strenuous play. Dr. LoSasso points out that young kids often don't grasp that a puppy needs breaks — all that adorable energy gets burned off, the puppy gets lethargic, and then it's too lethargic to eat, which only deepens the crisis. Warning signs escalate from severe lethargy and dullness to seizures once blood sugar drops below roughly 50 mg/dL (normal is around 100); he's seen puppies arrive with blood sugar too low for his glucometer to even register, down around 20.

Home first aid for a hypoglycemic puppy

Rub corn syrup, maple syrup, or honey directly onto the puppy's gums — do not try to get the puppy to eat or swallow it. Sugar absorbed through the mucous membranes of the mouth reaches the bloodstream almost immediately; sugar that's swallowed has to be digested first, which takes too long when a puppy's brain is already starved for glucose. This buys critical time, but the puppy still needs to be seen by a vet right after.

"The canine pancreas is just not that smart — when you give it something a thousand times sweeter than sugar, it says, 'Holy cow, look at all this sugar!' and releases a bunch of insulin to counteract what it thinks is a huge sugar load. But there's no sugar there to counteract, so blood sugar crashes."
— Dr. Michael LoSasso, DVM — on xylitol

Beyond young puppies, Dr. LoSasso flags two other causes worth knowing. Accidental double-dosing of insulin in diabetic pets — one household member gives it, another doesn't realize and gives it again — drives blood sugar dangerously low and requires hospitalization with sugar support until the excess insulin clears. And xylitol, a sugar alcohol roughly 1,000 times sweeter than sugar, tricks a dog's pancreas (unlike a human's) into releasing a flood of insulin it doesn't need, crashing blood sugar the same way overeating real sugar wouldn't. It's commonly found in sugar-free gum — he specifically names Ice Breakers — and some sugar-free candies. Because xylitol content varies by product and manufacturers treat it as proprietary, he relies on Pet Poison Helpline and the ASPCA Poison Control Center to know exactly how much is in a given product. Separately from the blood sugar crash, xylitol can also cause dose-related liver failure, making any suspected ingestion an immediate trip to the vet.

Recovery for a hospitalized puppy typically takes 12 to 24 hours — long enough to get them eating consistently again and holding a stable blood sugar without IV support. After going home, the plan is simple: frequent small meals and less strenuous play until the puppy grows enough to build its own energy reserves.

Questions answered in this episode

The following questions are answered by Dr. LoSasso in this episode, drawn directly from the conversation. These are real clinical answers from a practicing emergency veterinarian with 30+ years of experience.

Toy-breed puppies, generally 12 weeks or younger — Yorkies, Chihuahuas, Schnauzers, Dachshunds, and similar small breeds. Dr. LoSasso explains these puppies haven't yet developed glycemic stores in their bodies, so they're entirely dependent on regular eating to keep their blood sugar up. Adult dogs and kittens are rarely affected unless something else is seriously wrong.
Anything that reduces how much or how often a puppy eats: internal parasites, parvovirus, an upper respiratory infection, the stress of shipping or a recent move, a food change, or simply too much strenuous play without a break. Dr. LoSasso notes kids often don't realize a puppy needs to stop playing and rest — burning off energy without refueling can tip a small puppy into a crisis.
Severe lethargy and dullness come first — the puppy is unusually quiet, unwilling to move, and often refuses to eat, which then makes the problem worse. Dr. LoSasso says normal blood sugar runs around 100 mg/dL, and seizures become a real risk below 50; he's seen puppies arrive with blood sugar too low for a glucometer to even read, down around 20.
Dr. LoSasso says to rub corn syrup, maple syrup, or honey directly onto the puppy's gums — not feed it to them. Sugar rubbed on the gums absorbs quickly through the mouth's mucous membranes and raises blood sugar almost immediately; sugar that's swallowed has to be digested first, which takes too long in a true emergency. After first aid, the puppy still needs to be seen by a vet.
Xylitol is a sugar alcohol roughly 1,000 times sweeter than sugar. The human pancreas recognizes it isn't real sugar and ignores it, which is why it's marketed as a diabetic-friendly, zero-glycemic sweetener for people. A dog's pancreas isn't that discerning — it reacts to the intense sweetness by releasing a surge of insulin as if a huge amount of real sugar had been eaten, which then crashes the dog's actual blood sugar. Xylitol is commonly found in sugar-free gum (Dr. LoSasso specifically flags Ice Breakers) and some sugar-free candies. Separately from the blood sugar crash, xylitol can also cause dose-related liver failure, so any suspected ingestion needs immediate veterinary attention.
Hospitalized puppies typically need 12 to 24 hours of care until they're eating consistently and can maintain a stable blood sugar without IV sugar support. After going home, Dr. LoSasso recommends frequent small meals and limiting strenuous play until the puppy grows enough to build real energy reserves of its own.
JulieA sudden drop in blood sugar can turn a normal day into a life-threatening crisis, but fast action can save a pet's life. Could you please explain what hypoglycemia is in pets?
Dr. LoSassoSure — for your dogs, honestly, it's not much of a danger. The patients we see most at risk for low blood sugar are puppies, usually toy breeds — Yorkies, Chihuahuas, anything young enough, Schnauzers, Dachshunds. Smaller dogs don't have glycemic stores yet, nothing in their body has matured enough to store energy, so they're dependent on eating. Most of your body needs insulin to move sugar out of the bloodstream and into tissue — that's why diabetics have high blood sugar, they don't have enough insulin, so their tissues are starving even though the glucose is right there. But there's one organ that doesn't need insulin — it draws its energy straight from the bloodstream — and that's the brain. So if blood sugar drops, the body can handle that, but the brain can't, and you want a happy brain. With really young toy breed puppies, if they're not fed often enough, or they've got a poor appetite from internal parasites, parvo, an upper respiratory infection from coming out of a pet store, shipping stress, a food change — all of that can decrease appetite. People need to pay attention, because if a puppy becomes hypoglycemic — maybe a six, seven, eight-year-old kid doesn't understand you can't play with the puppy for hours straight, he needs a break — all that energy gets burned, and now he's lethargic, and so lethargic he doesn't want to eat, which compounds the problem. Then we see what happens when the brain gets deprived of the sugar it desperately wants: seizures pretty commonly. Normal blood sugar is about 100 mg/dL; below 50, there's a real chance of seizures. I've had puppies brought in with blood sugar too low to read — my glucometer only goes down to about 20. These pets are critically in danger.
Dr. LoSassoFortunately, fixing hypoglycemia at home, before you get to us, is actually pretty easy — Karo syrup or honey, rubbed directly on the gums. You're not trying to feed them — if you ingest something like corn syrup, maple syrup, or honey and digest it, it takes a while to get that sugar into your bloodstream. We don't want them to eat it, we want to rub it on the gums, because they'll absorb that sugar directly through the mucous membranes of the mouth and get an immediate blood sugar effect, which wouldn't happen if they actually ate it. That's the number one reason we see hypoglycemic pets.
Dr. LoSassoThe other, less common, reason is an accidental insulin overdose — one owner gives the insulin dose, the other doesn't realize it and gives another. Communication matters with diabetic pets. Too much insulin drives blood sugar down, and we hospitalize those pets on sugar support until the extra insulin wears off. There's also sepsis, but that's really sick dogs, not something people would see at home. The other big one is xylitol. When people eat xylitol, a sugar alcohol, it's not actually a sugar molecule but it's super sweet — maybe a thousand times sweeter than sugar. The human pancreas looks at that and says, that's not sugar, no need to get excited — it's a great sweetener for people, zero glycemic index, good for diabetics and weight loss. The canine pancreas isn't that smart — given something a thousand times sweeter than sugar, it says "holy cow, look at all this sugar" and releases a bunch of insulin to counteract a sugar load that isn't actually there, and you end up with really low blood sugar. Those pets end up in the same place as the puppies. Xylitol is found in sugar-free gum, especially the little chewable squares — Ice Breakers is actually the bad one. The real challenge is we have no idea how much xylitol is in any given product, they're all proprietary recipes, but the Pet Poison Helpline and ASPCA Poison Control Center know exactly how much is in each product because they've talked to the manufacturers, so we rely on them. The other downside to xylitol, separate from the hypoglycemia, is it can cause dose-related liver failure — another reason you don't want it around your dogs.
JulieAre the most common symptoms seizures, or collapsing?
Dr. LoSassoBefore seizures, you just see serious lethargy — they're run down, not moving, really dull because blood sugar is low. You see this in human diabetics too — somebody who needs orange juice or a candy bar feels pretty sluggish, some people even get erratic, but usually it's a sign of too much insulin relative to the sugar actually available.
JulieWhat about cats — is this common with them?
Dr. LoSassoKittens, for whatever reason — I think because they don't get played with by kids quite like puppies, and people tend to leave kitten food out and free-feed better — it's really a husbandry thing. We very rarely see hypoglycemia in kittens unless it's a really sick, really young kitten.
JulieI never even thought hypoglycemia could affect pets — is lethargy the main thing to watch for?
Dr. LoSassoThat's the number one sign. We're generally talking about puppies 12 weeks and under, toy breeds — unless you're getting a really young puppy, this isn't really a concern for you. But if you get a Yorkie puppy from a breeder, or especially from a pet store, there's likely going to be a lot of parasitism and GI disease that really decreases their ability to eat and absorb nutrients — that sets them up for a hypoglycemic crisis once you get them home. For your own dogs, it's about not keeping Ice Breakers in your purse, or keeping your purse up high where dogs can't get to it, because they do like it. We see the gum dogs and the hard candy dogs — we induce vomiting right away, then deal with the hypoglycemia, and occasionally the liver disease.
JulieAfter you stabilize a patient, what does follow-up look like?
Dr. LoSassoIf it's a puppy with us for 12 or 24 hours, we get them back to eating — because it was exactly the not-eating that caused the low sugar in the first place. One of my own kids did the same thing as a toddler, actually — got hypoglycemic, threw a fit, and wouldn't eat, which was the one thing he needed to do to feel better. People do this too. Once they're eating consistently in the hospital and blood sugar stabilizes without us needing IV sugar, we send them home with strict instructions: feed frequently, decrease playtime, so they can get a bit bigger, put on some weight, and build a little storage capacity before they're allowed to really play hard again.

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