I use Advantage for all my animals,I Keep them on it all summer long,Just dont want to take a chance as we go for frequent walks and are around other dogs,and you just dont know.

For the cats its about 10 dollars for a single dose,the dogs are about 15 dollars per dog.

I hope you have got something by now,If they have flees it should be treated right away,Not left.It drives them crazy.