A plain-language guide for dog owners. In an emergency, go straight to your vet or an emergency clinic.

What to watch for, on a listing and in your dog

Some red flags show up before anything reaches your dog, right there on the listing. Others show up later, in the dog. Here are both, along with who to call and how to tell the FDA if something goes wrong.

Line drawing of a healthy young dog sitting upright by a tall window, ears up, watching a tree outside.

Red flags on a listing

A “research use only” label on something pitched at dog owners
The FDA judges a product by how it is sold and what the seller claims, not by the disclaimer.
No “Approved by FDA under NADA #” or “ANADA #” line
An approved animal medicine carries that line, with its FDA application number: NADA for a brand, ANADA for a generic. A tiny bottle label may leave it off, so the box or leaflet is the place to look.
Promises to heal, cure or turn back the clock
Under US law, anything sold to treat or heal an animal counts as a drug, whatever the listing calls it. The FDA’s own example: even bottled water becomes a drug if it is sold as a cancer cure for dogs.
Official-looking marks standing in for an approval
An NDC number (a product listing code), a “Federal law restricts” caution line or “made in an FDA-registered facility” does not mean a product is approved or legal for animals.
“No side effects reported”
Makers of unapproved animal drugs do not have to report side effects, so silence is not evidence of anything.
No vet prescription asked for
Prescription animal medicines may be handed over only by a licensed vet or on a vet’s order.
Sterile mixing water or a “dosing calculator” offered alongside
Mixing water is sterile water sold for turning a powder into an injection. In warning letters to sellers of peptides for people, the FDA pointed to mixing water and dosing calculators as signs the products were meant to be injected. The same extras on a dog listing point the same way.

The longer look: why regulators worry

The FDA says unapproved animal drugs haven’t been checked to see whether they are safe or whether they work. They may be badly made or wrongly labeled, and their makers don’t have to report side effects. So problems can go unnoticed for a long time.

Injections carry a particular risk because they skip some of the body’s natural defenses. The FDA stressed this in a warning letter about injected peptides sold for people, not pets.

A peptide from one species can make another species’ immune system fight it. The immune system does this by making antibodies, proteins that mark something as foreign. Diabetic dogs given insulin taken from cows often made antibodies against it. Dogs given pig insulin, which matches a dog’s own, made no more than dogs that had never had insulin. Researchers aren’t sure what those antibodies do to a dog’s health, but the result shows that the exact makeup of a peptide matters to the animal getting it.

For people, the FDA has flagged possible immune reactions and impurities with BPC-157, and it has published no assessment of it for pets.

With an unregulated product, nobody has checked everything that is in it, and things that are harmless for people can hurt dogs. Xylitol, a sweetener in sugar-free gum and some peanut butters, can drop a dog’s blood sugar dangerously within 10 to 60 minutes. Nothing suggests any peptide product contains it. It is simply one example of why a full, checked ingredient list matters for a dog.

If your dog reacts badly

The FDA’s advice to owners, if a pet reacts badly to any medicine, is to contact the vet first and get the pet treated, then report it. Take the product and its packaging with you.

On its page about xylitol poisoning, the FDA names three places to call right away: your vet, an emergency clinic, or an animal poison control center.

About the animal poison lines

Two US animal poison lines describe themselves as open around the clock: ASPCA Animal Poison Control and Pet Poison Helpline. Both can charge. The ASPCA says a consultation fee may apply, and Pet Poison Helpline states an $89 fee per incident, follow-up calls included, as of September 2026.

Their numbers and fees change, so the current ones are best taken from each service’s own website before you ever need them. Pet Poison Helpline also warns against making a pet vomit unless a vet or the helpline says to.

Telling the FDA about a problem

The FDA wants to hear about side effects from any animal medicine, even an unapproved or pharmacy-mixed one. That includes a product that didn’t work or looked wrong, like a broken seal or an odd color.

The longer look: how a report works

For an approved medicine, the FDA suggests calling the drug company, which must pass the report on to the agency. For unapproved or compounded products, the report goes on FDA Form 1932a, which is emailed to CVM1932a@fda.hhs.gov. The fillable form works on a Windows or Mac computer, not on a phone or tablet.

The FDA keeps the names of people and animals in these reports confidential. Your vet can help fill it in, and reporting is never a stand-in for getting your dog seen.

A note on puppies

The sources behind this guide don’t single out puppies. A young dog is still growing, and your vet is the one who can weigh what that means for yours.