Flea Treatment Calculator: Find Your Pet Weight Band
Find the typical flea-product weight band for your dog or cat. Confirm the exact dose with your vet.
This shows the typical product weight band only. Always confirm the exact product and dose with your veterinarian.
How flea treatment dosing works
Most spot-on and oral flea treatments are sold in weight bands (for example, 11 to 22 lbs). Using the band that matches your pet's current weight is important: too little will not work, and a dog product can be dangerous for a cat. This tool shows the typical band, not a specific dose.
Safety first: Never use a dog flea product on a cat. Some dog ingredients (like permethrin) are toxic to cats. Always read the label and ask your vet.
How to use it
- Weigh your pet (a recent weight matters, especially for growing puppies and kittens).
- Select dog or cat.
- See the typical weight band, then match it to a vet-recommended product.
Choosing a flea treatment
Spot-on vs oral
Spot-ons are applied to the skin; orals are chews. Orals avoid residue but need your pet to eat them. Both should be vet-recommended.
Prevention beats treatment
Year-round prevention is usually easier and cheaper than clearing an infestation, which also requires treating the home.
When to see a vet
See your vet before starting treatment on puppies, kittens, pregnant, nursing, or sick pets, or if your pet has had a reaction before. If fleas persist despite treatment, your vet can check for resistance or an environmental source.
Frequently asked questions
- Can I use a dog flea treatment on my cat?
- No. Some dog ingredients are toxic to cats and can be fatal. Always use a cat-specific product confirmed by your vet.
- How do I know the right flea product weight band?
- Weigh your pet and match the current weight to the band on the product. This tool shows the typical band.
- How often should I treat for fleas?
- Most products are monthly, but follow the specific product and your vet's guidance, ideally year-round.
- My pet still has fleas after treatment, why?
- Often the home environment is reinfesting them. Treat bedding and carpets, and ask your vet about the product choice.
More free pet tools
This tool gives general guidance and is not a substitute for professional veterinary advice. For any health or dosing concern, consult your veterinarian.