Identify the correct weight band product size and annual treatment cost.
Parasite treatments are supplied in weight bands, so the correct product is determined by which band the animal falls into rather than by calculation. Animals near a band boundary should be weighed rather than estimated. Splitting a large-dog dose between small animals is dangerous because the concentration is not uniform and some active ingredients are toxic to cats.
Flea/Tick/Heartworm Dose
Doses = weeks in the period ÷ treatment interval, rounded up
Parasite treatments are veterinary medicines. Use only products licensed for the species and weight, never divide or combine doses, and never apply a dog product to a cat. Some permethrin-based dog treatments are fatal to cats. Consult your veterinarian for the appropriate product.
Doses = weeks in the period ÷ treatment interval, rounded up Parasite treatments are supplied in weight bands, so the correct product is determined by which band the animal falls into rather than by calculation. Animals near a band boundary should be weighed rather than estimated.
Splitting a large-dog dose between small animals is dangerous because the concentration is not uniform and some active ingredients are toxic to cats.
This calculator takes 4 inputs: Body weight, Treatment interval, Cost per dose, Months of coverage needed. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.