Dog Supplement Regulations in the US: FDA, AAFCO and the NASC Seal
Dog supplements sit in a gray zone between food and drugs. Here is how US rules apply to functional chews, and where the NASC Quality Seal fits.

Dog supplement regulations in the US are the federal and state rules that decide whether a functional chew is treated as animal food or as an animal drug, based mainly on its ingredients and the claims made for it. Unlike human dietary supplements, animal supplements do not have their own federal category, which is why labels and claims need extra care.
This guide explains the framework in plain terms for brands, distributors and importers. It is a practical overview, not legal advice; for a specific product, confirm the position with the FDA, the relevant state feed control officials or a regulatory adviser.
Is a dog supplement a food or a drug?
Under the Federal Food, Drug, and Cosmetic Act, a product for animals is regulated as a food or as a drug depending on its intended use. Claims to treat, cure, mitigate or prevent disease point to a drug. Support language, such as “supports joint health”, is how most supplement chews are positioned.
Intended use is judged from everything the company says about the product, not only the label. Product names, website copy, marketplace listings, social media posts and images can all show intended use. A chew with careful label wording can still raise questions if its online listing talks about treating a condition.
| Wording | How it is usually read |
|---|---|
| “Supports healthy hips and joints” | Structure or function style support language |
| “Supports digestive health” | Structure or function style support language |
| “Treats arthritis” | Disease claim, points toward drug status |
| “Prevents diarrhea” | Disease claim, points toward drug status |
| “Relieves allergies” | Likely read as a disease claim |
Ingredients matter as well as words. An ingredient that is not recognized as acceptable for use in animal food, or one that is associated with drug use, can raise questions even when the claims are modest. Before finalizing a formula, ask the supplier and your regulatory adviser whether each ingredient is accepted for use in animal products in the states where you plan to sell, and keep that review on file.
Why does DSHEA not apply to dog supplements?
The Dietary Supplement Health and Education Act, which created the dietary supplement category for human products, does not apply to products for animals. Animal supplements are therefore treated under the general food and drug framework.
This is the most common source of confusion for brands that come from the human supplement market. Practices that are routine for human supplements, such as relying on the dietary supplement category itself, do not carry over. The FDA has said that animal supplements may be regulated as food or as drugs depending on their claims and ingredients, and it decides how to apply its rules case by case.
Who regulates what in the US?
| Body | Role for supplement chews |
|---|---|
| FDA, Center for Veterinary Medicine | Federal food and drug rules, facility registration, food safety rules for animal food, Prior Notice for imports |
| State feed control officials | State feed laws, product registration and label review in many states |
| AAFCO | Publishes model regulations that many states adopt; not a regulator itself |
| NASC | Voluntary industry organization with an audited quality program and labeling guidelines |
| USDA APHIS | Animal health import requirements for animal-origin products and ingredients |
| US Customs and Border Protection | Customs entry, country of origin marking, release of imported goods |
How do state feed rules affect supplement chews?
States regulate animal feed, and many base their rules on AAFCO model regulations. Some states require registration of pet products, including some supplements, before sale. Check the requirements for the states where you sell.
Registration usually involves submitting the label, paying a fee and in some states renewing periodically. Requirements and fees differ by state, so build a state list early if you plan national distribution or marketplace sales. Our guide to dog treat label requirements explains the AAFCO model labeling points that many states follow.
What must a dog supplement label include?
- Product Facts panel with active ingredients per serving
- Inactive ingredients
- Directions for use and cautions
- Name and address of the company responsible
- Country of origin for imported products
Common additions include a statement that the product is for dogs, net quantity, a lot number and a best-before date. Cautions often include keeping the product out of reach of children and advising owners to consult a veterinarian if a condition persists. The panel should match the product specification exactly, including units and serving size.
What is the NASC Quality Seal?
The National Animal Supplement Council (NASC) is a US industry organization for animal health supplements. Member companies that pass an independent audit and follow NASC requirements, including labeling guidelines and adverse event reporting, can display the NASC Quality Seal. It is voluntary, but many retailers and buyers look for it.
The seal belongs to the brand company that passes the audit, not to the product formula alone. A brand sourcing private-label chews still needs its own quality processes, such as supplier qualification, complaint handling and adverse event records. A supplier that already works to NASC labeling guidelines and can provide batch documentation makes that work easier. Check current membership terms directly with NASC.
Which food safety rules apply to the producing facility?
Facilities that manufacture, process, pack or hold animal food for the US market, including many foreign facilities, generally need FDA food facility registration. Many are also subject to the FSMA Preventive Controls for Animal Food requirements, which call for a written food safety plan, hazard analysis and controls. US importers are generally expected to verify their foreign suppliers under the Foreign Supplier Verification Program. Ask the supplier how its plan covers your products, and confirm your own obligations with a compliance adviser.
What do imported supplement chews need?
Imported supplement chews also need an FDA-registered facility and FDA Prior Notice for each shipment. Animal-origin ingredients, such as bovine chondroitin or fish oil, can add USDA APHIS requirements.
The customs entry is filed with US Customs and Border Protection, usually by a licensed customs broker, and the product must carry a country of origin marking. The full sequence for a first order is covered in our guide on how to import dog treats into the USA.
What should a compliance checklist cover before launch?
- Claims reviewed on the label, website and every marketplace listing
- Product Facts panel matched line by line to the specification
- State registration list for every state where the product will be sold
- Supplier documents: facility registration, specification, batch certificates
- Origin statements for every animal-derived ingredient
- Import plan: customs broker, Prior Notice, any USDA APHIS requirements
- Adverse event and complaint handling process
Chewport’s functional chews are produced for the US market with specifications, batch reports and import documents prepared on the supplier side. See the functional chews range.
Frequently asked questions
Are dog supplements regulated like human supplements?
No. The human dietary supplement law (DSHEA) does not apply to animal products; they are regulated as food or drugs depending on intended use.
Is the NASC Quality Seal required?
No. It is voluntary, but it signals an audited quality program and many buyers look for it.
Which claims are safe for supplement chews?
Support language about normal structure or function, such as supporting joint or digestive health. Disease claims change the regulatory status.
Do I need to register dog supplements with each state?
Some states require registration of pet products, including some supplements, before sale. Requirements differ, so check each state where you sell.
Does marketplace listing copy count as a claim?
Yes. Intended use can be shown by any statement about the product, including listings, websites and social media, not only the label.
Does the producing facility need FDA registration?
Facilities that produce animal food for the US market generally need FDA food facility registration, and many must also follow the Preventive Controls for Animal Food requirements.
Building a compliant supplement line?
Talk to us about formula, labeling and import paperwork for your functional chews.
Request a quoteThe US-facing pet line of Export Partners LLC. Wholesale and private-label functional chews, natural dog chews and freeze-dried treats, sourced in Turkiye with FDA and USDA compliance handled on the supplier side.



