Cautions, signs to watch for, and emergencies

My dog seems unwell after a product. What now?

Short answer: The vet comes first, or an emergency vet if your own is closed. The FDA gives owners the same first step: contact the vet and get the animal treated.

For a possible poisoning, two US animal poison lines describe themselves as open around the clock. They are ASPCA Animal Poison Control and Pet Poison Helpline.

As of September 30, 2026, ASPCA Animal Poison Control said a consultation fee may apply. Pet Poison Helpline stated a fee of $89 per incident, with follow-up calls included.

To reach either line, look up the service by name: the number to call is printed there, and it is kept current. The clinic your dog already goes to can help as well.

Pet Poison Helpline also says not to make a pet vomit without first asking a vet or the helpline.

Take the product or its label with you, so the vet can see what your dog was given.

What does "unapproved" mean for my dog?

Short answer: It means nobody outside the seller has checked that the product is safe, that it works, or that each batch is made the same way.

Makers of unapproved animal drugs also do not have to report side effects to the FDA. So problems can be slow to come to light.

That is why "no side effects reported" is not a sign that a product is safe.

What have lab tests of peptides sold online found?

Short answer: Some held less of the peptide than the label said, some held undeclared extras, and some held none at all. No testing of products sold for dogs was found.

A racing-industry group reported that a university lab in California tested products labeled TB-500 that were sold for horses. Many contained none of the peptide they claimed, though one sample did.

In another study, researchers tested three vials of a weight-loss peptide from illegal online pharmacies. The drug was only about 8 to 14 percent pure, and every vial held bacterial toxins.

Those tests were on products sold for people, not dogs. They show what the unchecked peptide market can look like, not what is in any one vial.

Why are injections a special worry?

Short answer: In a 2026 warning to a seller of injectable peptides for people, the FDA pointed out that injections skip some of the body's defenses against germs and toxins.

The FDA wrote that about people, not dogs. Still, the reasoning is easy to follow.

Can a peptide upset a dog's immune system?

Short answer: It can. A dog's body can react against a peptide that is built differently from its own.

Insulin shows this. In one study of dogs with diabetes, 90 percent of those given cow insulin made antibodies against it. Antibodies are how the immune system marks something as foreign. Dogs given pig insulin, which matches dog insulin, made no more antibodies than untreated dogs.

So small differences in a peptide can matter to a dog's body, and the peptides sold online have not been tested for this in dogs.

For people, the FDA has said BPC-157 and TB-500 may cause immune reactions and can contain impurities. That FDA page says nothing about dogs.

Is a dog just a small person when it comes to medicine?

Short answer: No. The FDA approves animal drugs one species at a time, and approval for people does not cover dogs.

Even an ingredient that is harmless in human products can poison a dog. Xylitol, a sweetener in sugar-free gum, can cause a dangerous drop in a dog's blood sugar within 10 to 60 minutes.

With an unchecked product, the full list of what is inside is unknown. Approved medicines print known drug clashes on the label, while online peptides have no such information at all.

How do I tell the FDA about a problem?

Short answer: The FDA wants to hear about side effects from any animal drug, even one that is unapproved or mixed by a pharmacy.

For an approved medicine, the FDA suggests calling the drug company, which must pass the report on. For anything else, including a peptide bought from a website, the FDA has a form to fill in and send by email, called Form FDA 1932a.

The form has to be filled in on a computer, because phones and tablets are not supported. The FDA reporting page listed below walks through each step.

A medicine that did not work, a mix-up with amounts, or a package that looked wrong can all be reported too.