I only use it for my dogs , it is expensive . I could not aford to buy that for my cats . For the dogs it is between $35 and $60 I believe . I will have to buy next month again then I know for sure the cost .
I've been wondering that myself. My cats are indoor-only and I don't like putting chemicals into their systems unless it's necessary. Seeing how we only have warm weather for a few months, is it necessary during that time? Our nights are already getting down into the 40s and supposedly in the 30s by the weekend, the mosquitos aren't a threat anymore.