Last year I bought some Advantage Multi for 110 lb dogs to be used on my cats. When I went to use it, I need to get the math right so I had to do some serious research. It was difficult to find the percentages and doses to compare, but I did. I then noticed the warning to not use it on cats. What I discovered when I did the math is that the flea medicine could be compared to the dosage required for cats, basically giving me 5 doses per vial. But the heartworm medicine used was at 5 times the dose needed for cats. That was way over the top.

I gifted the pack to a shelter. I'm sticking with single med packs from now on.