There's a higher percentage of fenbendazole in the dog wormer (22.2%.) A less percentage (10% fenbendazole) is all that is needed to take care of worms in chickens. The safeguard equine paste dosage for chickens is a "pea" size amount given individually to each chicken.check the active ingredients in the dog wormer, I believe its the same as for the goat wormer, if its also 10%, then the dosing would be the same as well. The safeguard horse wormer is .