Just to caution about using meds for off-label uses; they might work, but it's against federal law to use pesticides for anything that is not on the label (and let's face it, wormers and external parasite treatments are pesticides). Be careful in publicizing if you do it...please.

Usually there's not been enough research to determine side effects, dosages, etc. for creatures not on the label...my parents use ivermec for their goats and for their cow (when they had one) and get the vet to prescribe a different dosage for the goats because of differences in size/metabolism, etc. Bottom line, if you are going to use pesticides for off-label animals, please have a vet's recommendation to back it up if you get caught or if you OD your animals and do harm (not likely, I'll admit, but it could happen).