Supplements & Pets: Hidden Risks Beneath the “All-Natural” Label
Why “all-natural” doesn’t always mean safe—and how to protect your pets.
At MoVET, we love seeing how much care our clients put into their pets’ health. Supplements have become incredibly popular—not just for people, but for pets too. From calming chews to joint support treats, there’s no shortage of products claiming to boost your pet’s well-being.
But here’s the truth many pet parents don’t realize: some supplements can be dangerous for dogs and cats, especially when pets accidentally eat too much, or get into human products.
The Pet Poison Helpline reports a sharp rise in supplement-related poisoning calls, and Dr. Renee Schmid, DVM, one of their toxicology experts, explains why. Products change constantly. New formulas hit the shelves every month. And the ingredients list—both active and inactive—matters far more than the marketing on the front label.
At MoVET, we want you to feel empowered and prepared, so here’s a breakdown of what to watch for.
Pet Supplements: Good Intentions, Real Risks
Many pet supplements come as flavored chews—think soft treats with enticing smells. That means dogs (and some cats!) may eat way more than they should if they get into the container.
A few common ingredients can cause serious reactions when ingested in large amounts:
1. L-Tryptophan (“Calming” Supplements)
Often used for anxiety or stress relief, L-tryptophan is safe in proper doses—but an overdose can cause:
Tremors
Vocalization
Ataxia (wobbly walking)
Vomiting
Hypersalivation
Symptoms can develop quickly—within 10 minutes to an hour—and may last several days.
2. Glucosamine & Manganese
Typically found in joint supplements, so it’s important to consult with your veterinarian on the quality of the supplement prior to giving it to your pet. These cases can often require bloodwork and supportive care. When pets eat too much, they can experience:
GI upset
Tremors
Liver dysfunction
Hypernatremia (dangerous sodium levels)
3. “Grass Saver” Chews
These products often contain methionine, which acidifies urine to prevent lawn spots. Methionine overdoses can lead to tremors and seizures lasting up to 48 hours. As Dr. Schmid jokes: “If there’s still grass discoloration—just replant the grass!”
Human Supplements Are Even More Dangerous
Pets getting into human vitamins or supplements is one of the top reasons the Pet Poison Helpline gets emergency calls. A few ingredients are especially risky:
1. Iron (Especially Prenatal Vitamins)
Iron toxicity occurs quickly and can be fatal if not treated. Symptoms come in stages and may temporarily look like they’ve gone away before returning much worse. Early signs include:
Vomiting
Abdominal pain
Bloody stool
If you suspect iron ingestion, this is an emergency.
2. Alpha Lipoic Acid (ALA)
Found in many human antioxidant supplements. ALA poisoning often requires aggressive treatment. Cats are 10x more sensitive than dogs, and even tiny exposures can cause:
Vomiting
Tremors
Seizures
Severe hypoglycemia
3. Xylitol
A common artificial sweetener now found in flavored chewable vitamins, quick-dissolve tablets, and liquids.
Always check for xylitol if the product is flavored.
What Pet Parents Should Do
Read supplement labels—even pet products. Ingredients change frequently.Store supplements securely, just like medications.If your pet gets into any supplement—human or pet—call immediately. Time matters with toxins.
Pet Poison Helpline: 800-213-6680
petpoisonhelpline.com
You can also find emergency clinics near you at:
https://www.movetcare.com/emergency
A Note From MoVET
As we head into colder months and the busy holiday season, now is the perfect time to review what’s in your home, what supplements your pet is taking, and how to keep them safe.
If you’re unsure whether a product is safe or if your pet needs supplements at all, we’re here to help guide you. Every pet’s needs are different—and sometimes “more” isn’t better.
Schedule a wellness appointment with MoVET today to make sure your pet’s supplement routine is safe, effective, and appropriate for their age and health.
And remember, if your pet seems sick after getting into supplements or medications, go straight to the nearest emergency clinic. You can’t overdose on caution.
