I have read some horrifying accounts regarding use of OTC stuff, especially in younger or smaller dogs and cats.
Personally, I would rather leave this to the judgment of a Vet as to dosage, etc.
I also got advice regarding this from a shelter adoption counselor who has had 20+ yrs. experience with animals and she advised Frontline.
It worked wonderfully for me and if you use it consistently for three months all fleas are dead in all life stages. My cats are indoor only so that did the trick for us permanently. This was so different from the old days and the horrid smelling stuff that you had to use for spraying and bathing the animals. It was worth every penny.
The primary reason why this and the other one whose name I can’t recall offhand are so effective is because fleas have a life cycle that involves several stages and most products only kill the fleas who have hatched. Frontline works on the other stages as well so they don’t end up hatching. That’s why it has to be done consistently for every thirty days for three months.
I was more than pleased with the results—I was ecstatic. Not one single flea ever after.