I would like to know also. Have been using Advantage II but the cockapoo is still suffering…flea allergy. I’ve read that even one or two bites can trigger the allergy, and that the fleas have to bite and then they will die. Need something that really repels…
I’ve been using Seresto for 4 years now, and we love it. We’re in the south, so lots of icky bugs, and we are outside a lot. I think in 4 years we’ve maybe seen two fleas.
Just bought 3 of them…Kaching! 
I used them last year and they were great. This year I tried to go with topicals (Advantix) because the animals are blowing my vet budget, and springing for 3 of the collars at one time seemed too much. Now it’s August and my dogs have fleas. I should have listened to my previous self and just spent the $$ on the Seresto collars. I’ve spent that much on useless Advantix by now.
