I only use Advantage as my Mandy is allergic to fleas and will chew the hair off where they bite and get a rash that will spread. For me I put on Advantage every three weeks on her and every 6 weeks on the others. I don't have a flea problem if I stick to that.
I ran out of Advantage and Mandy hadn't had an application in 5 weeks and low and behold she chewed a patch of hair off her back. She is on Clavamox now and will hopefully grow the hair back soon. I feel like I let her down.
I don't know how I forgot to order it before but I won't do that to my poor girl again...
