Our cats have picked up fleas, and they have to go (the fleas, not the cats!).

How long after using Hartz Ultraguard Pro do we have to wait to use the Advantage we got from the Vet's office?  We put the Hartz crap on our cats last Tuesday, it didn't do squat.  Thankfully, it also didn't make the cats sick (as I've belatedly read that Hartz can do).

The vet tech said we had to wait a month before we could use the Advantage.  I was not able to confirm with the vet as he was in surgery this afternoon.

Any vets care to chime in?  Will try to get hold of our vet tomorrow.

Thanks,
Dave

Revolution is the best flea product for your cats in my opinion.

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If it were me I would wash the cat and apply the Advantage. They have different active ingredients which is why one works and the other doesn't.