About Winslow Pet Health

Winslow Pet Health reads the labels of 388 best-selling dog supplements and shows how much of each ingredient your dog gets a day at its weight, and what that costs.

What we do, and what we don't

• We read each brand's own label: the amount of each ingredient per chew, scoop or pump, and the dose it says to give by weight.
• We compare that dose with what studies used, where a study exists, and say which source we read.
• We check whether the maker holds the NASC Quality Seal on NASC's own member list.
• We are not vets and don't give medical advice. For a dog with a health problem, ask your vet.

Who runs it

Erin Rose, founder and editor. Guides are bylined "Winslow Pet Health editors".

How we make money

As an Amazon Associate, Winslow Pet Health earns from qualifying purchases. Brands can't pay to be included, ranked or picked, and picks follow the rules printed on each page.

Questions or a correction? Contact us. See how we check.

Last updated October 28, 2026.