Buy dog advantage for your cat
The regular Advantage for dogs and cats have the same active ingredients, there's just a larger volume in the dog packs. I buy a pack of 4 for large dogs for just a few dollars more than a 4 pack for cats and simply pour the tube into a pill bottle and use a syringe to pull up .4cc for a small cat or .8cc for a large cat. This means I can use each 4ml tube to treat 5 large cats, or 1 cat for 5 months, so the 4 pack that cost $40 then gives 20 large cat doses that would have cost me about $200 if I used Advantage for cats. If you've got 2 cats that saves over $160 a year! Then there are those of us with 4 cats!!