Bunny, here's the doseage that I used and this was given to me by Starr's foster mom from her vet.

The vet gave me two different size pills. The small one is 90 mg. and the large one is 409.8 mg. The dosages they gave me were based on the weights I provided and are as follows:

17 lbs. 2 large
14 lbs. 1 1/2 large
12 lbs. 1 1/2 large
8 lbs. 1 large
3 lbs. 1/2 large
1 lb. 1/2 small

I'm supposed to give the pills with a full meal and repeat this dosage in 2 weeks. Everyone gets the same dosage except for the 1 lb. kittens who will get 1 whole small pill at that time.

I used this website to buy mine online and you need to buy the dog program pills because the cat's come in a liquid suspension. Here's the link: entirely pets program pills. I hope that this will help you. Good luck.