On July 31, 2026, American Regent Animal Health issued a nationwide recall of four lots of Adequan injectable products after visible glass fiber material turned up during testing of internally retained samples. Two of those lots are Adequan Canine, the joint injection a lot of aging and high-mileage trail dogs are on.

We’ve covered FDA actions on trail dog medications before — the NexGard screwworm authorization back in February, the H5N1 guidance just yesterday. Joint injections are new territory for this site. There wasn’t a reason to cover them until now. If your vet has your dog on a PSGAG protocol for hip or elbow wear, this is worth five minutes of your attention today, not eventually.

Quick Verdict: Adequan Recall at a Glance

Detail	What You Need to Know
Recall date	July 31, 2026
Issued by	American Regent, Inc. Animal Health
Products	Adequan Canine Injection (dogs) and Adequan i.m. Injection (horses)
Affected lots — Canine	#3369 and #25011
Affected lots — i.m. (equine)	#24416 and #25265P
Cause	Visible glass fiber material found in internally retained samples
Distribution	Nationwide — vet practices, online pharmacies, distributors, wholesalers
Distribution window	May 2024 through January 2026
Reported adverse events	None reported to American Regent as of the recall date
Your action	Check the lot number on the vial. If it matches, stop using it and call your vet.

What Was Actually Recalled

Two separate products got pulled, and it’s worth being precise about which one applies to your dog.

Adequan Canine Injection (100 mg/mL, 5 mL multi-dose vials) is the dog-labeled product. Lot #3369 was distributed May 22, 2024, and expires October 31, 2026. Lot #25011 went out April 14, 2025, and expires December 31, 2027. If your dog gets Adequan injections, these are the numbers you’re checking for.

Adequan i.m. Injection (500 mg/5 mL single-dose vials) is labeled for horses, not dogs. Lots #24416 (distributed May 8, 2025) and #25265P (distributed January 22, 2026) are the recalled equine lots. If your household has both a trail dog and a horse — not unusual among the backcountry and ranch-adjacent crowd who reads this site — check the barn fridge too.

Both products share the same active ingredient and the same manufacturing concern, which is why they got recalled together. But if you’re only here for the dog, the two lots that matter are 3369 and 25011.

The cause, per American Regent’s recall notice filed with the FDA, was glass fiber material discovered during testing of samples the company retained from those lots. Not a report from the field. Not a complaint. Internal quality testing caught it, which is exactly what that testing is supposed to do.

Why This Recall Lands Differently for Trail Dogs

Adequan Canine is a disease-modifying osteoarthritis drug — an injection containing polysulfated glycosaminoglycan (PSGAG) that supports cartilage and joint fluid rather than just masking pain. It’s typically dosed twice weekly for several weeks, then tapered to a maintenance schedule. It’s the product a vet reaches for when a dog’s joints are showing real wear, not the first-line option for a puppy with an off day.

That means the dog population on Adequan skews toward exactly the dogs this site writes about: the ones with miles on them. Labs and Goldens a few years into regular trail use. Working-breed mixes with hip or elbow dysplasia. Any dog putting up big mileage days who’s started slowing down on descents or getting stiff after a long hike. We’ve written about how CCL ruptures hit the same population of active, well-conditioned trail dogs — high-drive, high-mileage, and carrying more cumulative joint load than a couch-bound dog ever will. Adequan is frequently part of the management plan once a dog is dealing with degenerative joint changes, whether from age, a previous orthopedic injury, or just years of trail mileage adding up.

If you’ve read our piece on conditioning lessons from Iditarod sled dogs, you already know we take joint and connective tissue care seriously for dogs logging serious distance. Adequan is part of that conversation for a meaningful number of readers here. That’s why a recall on this specific product is worth a dedicated post, even though it’s not a trail hazard in the traditional sense.

How to Check If Your Dog’s Vial Is Affected

1. Find the vial. If your dog gets Adequan at home, check your fridge. If your vet administers it in-clinic, call and ask them to check their stock against the recalled lot numbers.
2. Look at the lot number on the label. It’s a short alphanumeric code, usually near the expiration date.
3. Compare it to the recalled Canine lots: 3369 and 25011. If it matches either one, stop using that vial.
4. Don’t administer another dose from that vial, even if your dog has tolerated previous injections from it without issue.
5. Call your vet before your dog’s next scheduled dose. They’ll confirm whether your clinic’s supply is affected and can get you a replacement vial from an unaffected lot.
6. Report any injection-site problems your dog has had recently, even ones you assumed were unrelated. Your vet needs that history if the lot turns out to be one of the recalled ones.

What Glass Fiber Contamination Can Actually Do

Adequan is given intramuscularly, and that matters here. According to the FDA’s safety alert, administering an injectable product containing particulate matter like glass fibers can cause local irritation, swelling, inflammation, injection site pain, infection, or abscesses. Glass fibers don’t dissolve or metabolize. Injected into muscle tissue, they sit there as a foreign body, and tissue reacts to foreign bodies.

That’s a meaningfully different risk than, say, a mislabeled dose or a potency issue. This isn’t about the drug working less well. It’s about what got into the vial alongside it.

American Regent has stated it hasn’t received adverse event reports tied to the recalled lots as of the recall date. That’s a genuinely reassuring detail, but it’s also exactly the kind of thing that changes as more owners and vets check their supply against the lot numbers. Absence of reports two weeks in doesn’t mean absence of risk. It means check your vial regardless of whether your dog seems fine.

Signs to Watch For After a Recent Injection

If your dog has had an Adequan injection in the past few weeks and you’re not sure which lot it came from, keep an eye out for:

• Swelling, heat, or firmness at the injection site that doesn’t resolve within a day or two
• Pain when the injection site is touched, or reluctance to have that area handled
• Redness or discharge at the injection site
• Limping or altered gait that seems tied to the injection site rather than the joint originally being treated
• Fever, lethargy, or loss of appetite in the days following an injection

None of these are exclusive to glass fiber contamination — normal injection-site soreness happens too. But if you’re seeing anything beyond mild, brief tenderness, that’s a same-day call to your vet, not a wait-and-see.

What to Do If You Have an Affected Lot

Stop using it. That’s the whole first step, and it’s not optional.

Beyond that: contact your veterinarian if your dog has experienced any problems that might be related to the recalled product. If you’re managing your dog’s Adequan supply directly (some owners with vet-trained administration do), don’t just toss the vial in the trash — check with your vet or pharmacy about return or proper disposal.

Adverse events can be reported to the FDA at 1-888-FDA-VETS or through the FDA’s online reporting portal, and directly to American Regent’s pharmacovigilance line at 888-354-4857. Reporting matters even if your dog seems fine. The whole point of adverse event tracking is catching patterns before they’re obvious.

If Your Lot Isn’t Affected, Should You Still Worry?

Not about this specific recall. If your Adequan Canine vial’s lot number isn’t 3369 or 25011, the recall doesn’t apply to your dog’s current supply, and there’s no reason to discontinue a treatment that’s working.

What’s worth doing anyway: get in the habit of checking lot numbers when you pick up a refill, the same way you’d glance at an expiration date. It takes ten seconds and it’s the only real defense against a recall you might otherwise miss. Vet clinics are generally good about pulling recalled stock, but a vial that’s already in your home fridge for at-home dosing is on you to check.

Joint Support Beyond the Injection

Adequan is one tool, not the whole toolkit, and this recall is a reasonable prompt to think about the rest of it. For dogs managing joint wear from trail mileage, vets commonly layer in body weight management (excess weight is one of the most controllable factors in joint load), omega-3 fatty acids, and glucosamine/chondroitin supplements alongside or instead of injectable PSGAG, depending on how advanced the joint changes are. None of that replaces a vet’s actual treatment plan for a specific dog. But if this recall has you temporarily without your dog’s usual injection, it’s worth a call to ask what bridges the gap, rather than just skipping doses and hoping the joint holds.

A well-stocked trail first aid kit doesn’t treat degenerative joint disease, but the same principle applies here as everywhere else on this site: know what you’re carrying, know what’s current, and don’t assume gear or medication is fine just because it was fine last time you checked.

Bottom Line

Two lots of Adequan Canine — #3369 and #25011 — are part of a nationwide recall issued July 31, 2026, after glass fibers were found in retained samples during testing. No adverse events have been reported yet, but that’s not the same as no risk. If your dog is on Adequan, check the vial in your fridge or call your clinic today. It’s a two-minute check against a real, if rare, injection-site risk — and for a dog whose joints already need the help Adequan is supposed to provide, that’s worth the two minutes.

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Recall details sourced from American Regent, Inc. Animal Health’s nationwide recall notice, filed with the FDA on July 31, 2026, and the AVMA’s recall summary. Product background referenced from Adequan Canine’s official site. This is a developing recall — check the FDA notice directly for updates, and consult your veterinarian before making any change to your dog’s joint treatment plan.