I use frontline on my lil guys and never had a problem. But here is the catch, flea medicine doesn;t really stop fleas or ticks to "visit" our pets, it just stops them from biting and laying eggs. If they try to do so, they get infected with the medication and DIE
hehehe... That is why it is also very important to vacumm contantly, and if possible, to always put the carpet in the sun. I am considering getting frontline spray next time, didn;t know you could use on the house, thought was only to use on the animal...but it might be good to use a flea shampoo for now?!? Also, be careful with shampoo you use, some will wash away the flea medication from the skin!!