It isnt rocket science to get the right dosage. Half a tablet per 2.5kg bodyweight eg: one tablet as a worming dose per average sized cat weighing 5kg.
- stand on scales without cat and get your own weight, now stand on scales with cat, take one from the other and you have your cats weight - which is probably the way the vet will do it as a cat is not going to stand on the dog scales! I use Drontal for my dogs, but Panacur is a lot more palatable for cats - both are available on line, together with Frontline spot on. Save yourself vet prices, and an unnecessary consultation fee.