My feed and farm store gave me piperazine to worm my free-run chickens, saying that eating earthworms, slugs, etc. can give them intestinal parasites (worms). This medication is used for dogs and cats as well. My problem is with method of giving them the piperazine and the dosage. Directions state to give 15 drops piperazine per 6 lbs of body weight, and suggets putting it in their water or in food. Fine for dogs, but not so easy for chickens. Three chickens use the waterer, and are all different weights. What is the dilution in this situation? How else can I be sure they get the proper amount and what other ways to administer this are there. By the way, this is preventative medicine, as I have no reason to belive they are infested. What do you folks do with this issue?