i thought you were ment to put it on every 3 months not every month like this lady said she was doing
ive used it on mine and put it on every 3 to 4 months like it says on the packet.
the only reason i stated useing it was cos zac had a bad reaction to frontline, i had used frontline on him a few times before and he was always fine with it but the last time he had it he came out in large blisters all over his belly, was having small fits, and seeing things.
it does go in to the blood stream cos he wouldnt of had fits if it had just stayed on the skin, it would have to go in to the blood to get to his brain.
i bathed him 5 times a day for a week untill he was back to normal again.
also on another site i go on a lady used advantix on her dog and had the same thing happen to her dog as zac.