There are some fruit or meat flavored liquids that your vet can recommend that you can mix any medicine in. Alot of wormers though can taste of banana or apple if you look in the right place. Horse wormers are known for tasting pretty good. Usually not too bad. Try www.1800petmeds.com or www.petcarerx.com I'm going to start getting our dogs shots there since it is SO much cheaper, and I can give them myself. We've already gotten the dogs Heartguard there and it saved us alot of money compared to going to the vet. As for the ParaZap, I would be concerned for the long-term effects on the animals. I just won't try anything that is marketed only on the internet. Just my opinion.