No problem, Beeswax

That's a shame that people have lost pets. I guess, like anything else, there is a small possibility of a negative reaction.
I think some commercial brands, like Hartz, sell drops in pet stores, but I get mine through a prescription from the vet. That way I know my dog has the right dosage for her size. I use Frontline and I think it costs about $5 to $7 a month. I get the prescription from the vet once a year and then order through 1-800-Petmeds because it works out to be a tad cheaper.