I'm considering switching the dogs to Comfortis. Frontline just isn't cutting it anymore. I've used Capstar a couple times and was very happy with it, but I was kind of freaked out by a pill that lasted a whole month! But I recently found out that it's derived from a natural bacterium (that's toxic to fleas), not toxic (to humans or dogs) chemicals.
So, do you use Comfortis? If so, what has your experience been like so far? How do your dogs handle it---any reactions, upset tummy, etc.? What's the price like (since it's prescription-only)?