USDA Class A vs Class B License: What's the Difference?

2026-04-22 Dog Breeder Licensing Center

Every dog breeder and dealer regulated by the USDA holds one of two license classes under the Animal Welfare Act: Class A or Class B. The distinction is small in words but big in what it tells you about how a business gets its dogs. This guide explains the legal difference, who needs each, what to look for on a USDA certificate, and why the class matters when you're researching a breeder or planning to apply for a license yourself.

The One-Sentence Difference

Class A licensees breed and raise dogs on their own premises. Class B licensees buy and resell dogs they didn't breed. Everything else — facility requirements, inspection frequency, record-keeping — is substantially the same.

Class A — Breeder

A Class A license authorizes breeding and raising dogs on the licensee's own premises for wholesale or retail sale. This is the license most people mean when they say "USDA-licensed breeder." Under 9 CFR 1.1, Class A operations are limited to selling animals bred and raised at the licensee's own facility.

Who needs Class A: Anyone who maintains more than four breeding females and sells dogs sight-unseen (online, by phone, or by mail) must obtain a Class A license. Face-to-face sellers who meet the retail pet store rule and breeders with four or fewer breeding females are exempt.

What Class A cannot do: Class A licensees cannot buy dogs from other breeders and resell them — that activity requires a Class B license. If a Class A breeder sells dogs they acquired from another source, they are out of compliance and may have their license suspended.

Class B — Dealer

A Class B license authorizes the purchase, resale, transport, and brokering of dogs acquired from other sources. In practice, Class B licensees are dog brokers — they buy puppies from Class A breeders (or from other legal sources) and resell them to pet stores, research facilities, or other dealers. Class B dealers may or may not also breed dogs themselves; if they do, they must also hold a Class A license or have the breeding function covered under their Class B license depending on the specific activities.

Who needs Class B: Anyone who sells, transports, or brokers dogs acquired from another party (not bred and raised on their own premises) for more than $500 in a calendar year must obtain a Class B license.

Additional Class B subcategory — Random Source: A small subset of Class B dealers supply dogs to research. These "random source" Class B dealers face much stricter sourcing rules and are a vanishing segment — the 2014 Farm Bill prohibited NIH funds from being used to purchase dogs from Class B random source dealers, effectively ending the model.

Class C and Class R (the Other Classes You Might See)

USDA certificates also include Class C (exhibitor — zoos, educational exhibitors) and Class R (research facility — universities, pharmaceutical companies). These are not relevant to dog buyers. Every USDA certificate number contains the class letter as its middle segment: XX-Y-NNNN where Y is A, B, C, or R.

How to Read a USDA Certificate Number

USDA certificate numbers follow a consistent format: XX-Y-NNNN.

XX — a two-digit state code (not the USPS abbreviation; USDA uses its own state codes).
Y — the license class letter: A (breeder), B (dealer), C (exhibitor), R (research).
NNNN — a sequential number within that state and class.

Example: certificate 43-A-6252 is a Missouri (state code 43) Class A breeder, sequence number 6252. Our USDA license lookup lets you search active licensees by certificate number, name, DBA, or city.

What It Means When You're Buying a Puppy

If you're buying a dog from a USDA-licensed source, the class tells you where the dog was born:

Class A: The puppy was bred and raised on the seller's premises. You can ask to meet the mother dog, see the whelping area, and observe the conditions where the puppy grew up.
Class B: The puppy was acquired from somewhere else before being offered to you. Ask the dealer for the certificate number of the Class A breeder who raised the dog — USDA requires Class B dealers to document the source. You may also want to independently verify that source breeder's license and inspection record.

Neither class is inherently bad. Some Class B dealers curate a small network of Class A breeders and provide genuine value. Others source from high-volume commercial operations with poor welfare records. The class tells you the business model; the inspection history tells you how well they run it.

What It Means If You're Applying for a License

Choose your class based on your actual activity. You cannot "upgrade" a Class A to a Class B later — you apply for the license that matches what you plan to do. If you both breed and broker, you need Class B (which covers both) or separate Class A plus Class B arrangements per USDA guidance. A few rules of thumb:

Planning to breed and sell only your own puppies? Apply for Class A.
Planning to buy dogs from other breeders and resell? Apply for Class B.
Planning both? Contact USDA APHIS directly — your license will depend on your specific business structure.

Both classes require the same pre-license inspection, vet care program, facility standards, record-keeping, and annual inspections. The application fee is $120 and the license is valid for 3 years.

Verifying a Breeder's Class Before You Buy

Before committing to a puppy, look up the seller's USDA certificate on our license lookup or the official USDA APHIS public search tool. Confirm:

The certificate number matches what the seller provides (not just any number).
The class (A or B) matches what the seller claims.
The license is active — not expired, suspended, or revoked.
The address on file matches the facility location.
The inspection history shows reasonable compliance (occasional non-critical violations are normal; repeated direct or critical violations are serious red flags).