That gel-filled cooling mat your dog flops onto on a hot afternoon, or the migraine cap you keep in the freezer, may carry a hidden hazard that veterinary toxicologists are only now piecing together. New research from the ASPCA, published this month in the Journal of the American Veterinary Medical Association, links a familiar category of household product — reusable hydrogel cooling items — to a string of severe, sometimes fatal poisonings in dogs who chewed them open.
The culprit is acrylamide, a known neurotoxin, turning up in some of these gels at levels thousands of times higher than they should be. For the millions of dog owners who stock cooling beds, gel ice packs, and spa-style eye masks around the house, it is a warning worth taking seriously before the next warm spell or the next bored afternoon of chewing.
What the ASPCA found
Veterinary toxicologist Colette Wegenast, DVM, and colleagues reviewed 45 dogs with suspected acrylamide toxicosis drawn from the ASPCA Animal Poison Control Center's AnTox database between January 2024 and June 2026. The common thread: each dog had bitten into a polyacrylamide hydrogel product — most often a reusable hot-and-cold migraine cap, eye mask, or body wrap, with cooling pet beds and gel pads also implicated.
The outcomes were sobering. Of the 21 dogs with a known result, 14 — about 67% — died or were euthanized, while seven recovered fully. When death occurred, it often came within 24 hours of the dog swallowing the gel. Wegenast told veterinary outlets that ASPCA Poison Control is now fielding reports of suspected acrylamide toxicosis on a weekly basis, a frequency that pushed the team to get the warning out.
This was a case series, not a controlled trial, so it describes a strong pattern rather than proving cause beyond doubt. But the laboratory numbers behind it are hard to ignore.
Why these products can be so dangerous
Polyacrylamide itself — the long-chain polymer that gives these gels their squishy, moldable feel — is generally considered low-risk. The problem is leftover acrylamide monomer, the small, reactive building block that is supposed to be almost entirely used up during manufacturing. In well-made medical-grade hydrogel, residual acrylamide is held to 1.5 parts per million or less.
When researchers tested gel from affected products and a migraine cap matching a brand tied to seven of the exposures, they measured acrylamide monomer at 12,900 to 51,800 parts per million — roughly 8,600 to 34,500 times that medical-grade specification. A separate analysis by the Cambridge Polymer Group found about 4,900 ppm in a cooling pad from the same product line, work accepted for presentation at an October 2026 veterinary laboratory meeting.
Just how little it takes is startling: the study estimated that under 20 grams of this gel could deliver a toxic dose to a 20-pound dog. And because "nontoxic" is an unregulated marketing term, a label promising safety tells you very little about what is actually inside.
The products on your radar
The exposures in this report centered on a handful of everyday items most households never think of as dangerous:
- Reusable hot/cold migraine caps and headache hats — the stretchy gel-lined caps kept in the freezer.
- Gel eye masks and spa masks — small, soft, and easy for a curious dog to snatch off a nightstand.
- Cooling and compression wraps — the kind used for sore muscles and joints.
- Hydrogel cooling pet beds and cooling pads — marketed for dogs, yet made with similar gel fillings.
That last category stings the most for dog owners, because the product is bought for the dog. A pad designed to keep your pup comfortable in summer can become a chew target, and the ASPCA specifically flags cooling pet pads as items to monitor closely — especially around dogs who like to shred.
Signs of acrylamide poisoning in dogs
Symptoms typically begin within about 12 hours of a dog swallowing the gel, usually starting with vomiting. In the case series, the most common signs were:
- Vomiting — seen in 82% of dogs
- Rapid heart rate (tachycardia) — 56%
- Seizures — 53%
- Loss of coordination (ataxia) — 51%
- Tremors — 47%
Roughly a third of dogs showed behavior changes, and signs such as low blood pressure, heavy panting, and elevated body temperature also appeared. Bloodwork often revealed low potassium and high blood sugar. Because the neurologic signs — tremors, wobbliness, seizures — can mimic other emergencies, a dog's history of chewing a gel product is a critical clue to share with your vet.
What to do if your dog chews a hydrogel product
There is no known antidote for acrylamide, so treatment is supportive — controlling seizures and tremors, IV fluids, and correcting electrolytes — and time matters. The ASPCA's guidance for owners is clear:
- Call for help immediately. Contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435. Don't wait for symptoms to appear.
- Identify the product. Note the item and its ingredients if you can, and save the packaging for reference.
- Keep the evidence. Hold onto the chewed product; it may be needed for toxicology evaluation.
- Protect yourself, too. Acrylamide can be absorbed through skin, so wear nitrile gloves if you handle the gel or bathe your dog.
Activated charcoal, a go-to for many poisonings, is generally not recommended here because of aspiration risk when a dog is already having neurologic signs — another reason to let professionals direct care rather than treating at home.
How to protect your dog right now
You don't have to toss every gel product in the house, but a few minutes of dog-proofing goes a long way:
- Store migraine caps, eye masks, and gel packs in a drawer, freezer, or closed cabinet — not on a nightstand, couch, or bed where a dog can reach them.
- Supervise your dog on any hydrogel cooling pad or bed, and swap to a non-gel cooling option (an elevated cot, a wet towel, or a tile floor) for determined chewers.
- Replace any gel item that's been punctured or is leaking, and pick up the pieces right away.
- Teach the household — kids included — not to leave gel masks and packs lying around.
This is the same kind of quiet, everyday hazard we flagged with toxic "death cap" mushrooms in fall yards: not something most owners would ever suspect until it's an emergency. A little awareness now — knowing which products hide acrylamide and what the early signs look like — is the cheapest insurance you'll ever buy for your dog.
At Sidewalk Dog, we'd rather you never need that poison-control number. Keep it saved in your phone, keep the gel out of reach, and keep enjoying the cool-down season with a dog who's curious about everything — including the things that aren't good for them. For more seasonal safety tips and the latest dog news, browse the Sidewalk Dog blog.
