Cats are not small dogs, and that matters when it comes to fleas, ticks and heartworm. Many products made for dogs are unsafe for cats, and many cat owners assume an indoor cat does not need protection. This guide covers what to ask your vet and how to compare what you pay, without replacing your vet's advice.
Never use a dog product on a cat
Some flea and tick products made for dogs can seriously harm cats. Ingredients in certain dog treatments are toxic to cats, even in small amounts, and a dog's dose is not a cat's dose. Always use a product labeled for cats, matched to your cat's weight and age, and check with your vet before you start.
Indoor cats can still get fleas and heartworm
Fleas travel indoors on people, dogs and clothing, and mosquitoes can come inside, too. Heartworm can affect cats, including cats that never go outside. Cats often show few signs, which is one reason vets tend to recommend prevention rather than waiting to treat. Ask your vet what is right for your cat and where you live.
How prevention usually works
Most cat preventives are applied to the skin once a month, and some products combine flea and heartworm protection in one dose. Your vet will recommend a product based on your cat's age, weight, health and lifestyle. Cats usually need a prescription for these products, so a licensed pharmacy will confirm it with your vet.
Why weight matters
Cat products come in weight bands, just like dog products. A kitten, an adult cat and a large cat may each need a different size. If your cat is close to the edge of a band, or still growing, ask your vet which one to buy.
How to compare prices
Compare cost per month, not the price on the box. A multi-month pack looks expensive until you divide it by the number of months. Check the same product, in the same weight band, across several licensed pharmacies, and look for an autoship discount if your cat takes the same product every month. Our flea and tick comparison and heartworm comparison do this calculation for you.
The bottom line
Use only products made for cats, match the size to your cat's weight, and compare cost per month across licensed pharmacies. Your vet decides which product is right; the comparison only decides where to buy it.