Cat Flea Shampoo: Four Bottles, Four Clocks (2026)

The linked bottle is Veterinary Formula Clinical Care Flea and Tick Shampoo, 16 fl oz. The brand page prints pyrethrins 0.150%, piperonyl butoxide 0.300%, N-octyl bicycloheptene dicarboximide 0.479%, and other ingredients 99.071%. It says the shampoo is for horses, ferrets, dogs, and cats 12 weeks or older. The same page says to wet the coat for 2 to 3 minutes, lather, let the lather remain 5 minutes, and rinse. It also says not to reapply for 7 days. A results line on that page says it kills fleas, ticks, and flea eggs on contact during bathing. The brand FAQ says not to use it on open wounds and to consult a veterinarian. The listing’s own active-ingredient cell matches those three percents.

That is not every line shoppers will see. The listing age field says all life stages, which is not 12 weeks. A shopping bullet says the formula has up to 3 times more active ingredients than competitive brands and tells the reader to leave the lather 5 to 10 minutes. The gallon card uses that same 5-to-10-minute soak. The brand page opened here says 5 minutes. Do not average 5 and 5 to 10 into one clock, and do not treat the 3-times line as a percent. A different medicated Veterinary Formula shampoo is formulated for dogs and says it is not suitable for cats. That bottle stays off this card. A coat shampoo that is not a flea bath is a separate page: Persian coat shampoos.

The linked bottle is Advantage Treatment Shampoo, the 8 fl oz cat-and-kitten bottle. Its use-and-care sheet prints the same three actives at the same percents as the Veterinary Formula page: pyrethrins 0.150%, piperonyl butoxide 0.300%, N-octyl bicycloheptene dicarboximide 0.479%, and other ingredients 99.071%. The sheet names MGK 264 beside that third active. It is for cats and kittens over 12 weeks, for fleas and ticks. It says not to use it on kittens under 12 weeks, and not to repeat treatment for 7 days. The clock is a 2-to-3-minute wet, a full lather, and 5 minutes before the rinse. It also says to consult a veterinarian before use on debilitated, aged, pregnant, or nursing animals.

Matching percents do not make this the Veterinary Formula bottle. That page names horses, ferrets, dogs, and cats. This sheet does not. Do not move a flea-egg sentence from the Veterinary Formula results line onto this sheet. The sheet opened here says fleas and ticks. A Canadian Advantage cat shampoo is a different label, with a different age line and different percents, and those figures stay off this 8 oz card. A shop reprint that changes 99.071% to another other-ingredients figure also stays off.

The linked bottle is Adams Plus Flea and Tick Shampoo with Precor, 12 oz, model 100503441. The drugs.com monograph prints (S)-methoprene 0.10%, pyrethrins 0.15%, piperonyl butoxide 1.88%, and other ingredients 97.87%. It says to use it only on dogs, cats, and puppies or kittens older than 12 weeks. It says it kills fleas, ticks, lice, flea larvae, and flea eggs. Precor, the (S)-methoprene on that page, is the insect-growth regulator, with 28 days of control of pre-adult fleas and flea-egg hatch inhibition for 28 days. The monograph says the shampoo may be used full strength or diluted with 2 parts water, and it prints the amount as “11/3 tablespoons for each 5 lbs.” It says to work the lather for 3 to 5 minutes, that adult flea relief may be repeated every 7 to 10 days if necessary, and not to apply it more than one time per day. Consult a veterinarian before medicated, debilitated, aged, pregnant, or nursing animals.

Do not repair “11/3” into “1 1/3.” The Adams product page prints “1 1/3 tablespoons” and also “about 4 teaspoons for every 5 lbs.” Those are different printings. The listing’s active-ingredient cell is a third printing: other ingredients 99.089%, pyrethrins 0.075%, piperonyl butoxide 0.750%, and pyriproxyfen 0.086%. That cell does not name methoprene. A retailer reprint of model 100503441 still prints pyrethrins 0.15%, S-methoprene 0.10%, piperonyl butoxide 1.88%, and other ingredients 97.87%. Leave the conflict. Pyriproxyfen is not Precor on the monograph. An Adams dip and an Adams yard product are different labels. The FDA says a product for the house or yard does not go on the pet.

The linked bottle is Wondercide Flea and Tick Shampoo, rosemary, 12 fl oz. The listing model is FTLS012R, and the title says pets over 4 months. The brand page’s rosemary row is sodium lauryl sulfate 6.75% from coconut and/or palm, cedarwood oil 1% from Texas and Virginiana cedar, and rosemary oil 1%. The page spells the botanical name “Romarinus officianlis.” Inactives are water, glycerin, xanthan gum, and vitamin E, at 91.25%. The brand says the shampoo is phenol-free and clove-free. The cedarwood-only row is 2% cedarwood oil and no rosemary. Peppermint and lemongrass each pair 1% cedarwood with 1% of that oil. Do not paste those rows onto rosemary. The peppermint pregnancy note on the brand page applies to peppermint, not to this rosemary row.

The clocks do not agree. The brand how-to says to let the lather sit 10 minutes. The same site says to use it once weekly, or to repeat in 2 to 4 hours and not more than twice in 24 hours. The listing says use up to once per week and pets over 4 months, while its age field says all life stages. A marketing block on the brand page says the shampoo is safe for dogs and cats of all ages when used as directed, and that it kills flea eggs, larvae, and adults and repels fleas, ticks, and mosquitoes. A product-facts reprint says it kills adult fleas and flea eggs and repels ticks for up to 24 hours. A retailer card for the rosemary bottle lists cedarwood oil 1.0% and lemongrass oil 1.0%, and says to let the lather sit 2 minutes. That is not the brand rosemary row, and 2 minutes is not 10. The brand attributes an outside test to the formula. This page did not run that test.