For chickens most use the 10% fenbendazole liquid or paste for goats. Dosage for that is 0.25 ml or 1/4 ml per pound of weight. Give it orally for 5 consecutive days which will treat most worms except for tapeworms. If you give it once and repeat it again in 10 days, it will only treat roundworms and cecal worms. Capillary (thread worms,) gapeworms need the 5 day treatment.Thank you.I have prosense(safeguard) dog dewormer on hand which has fenbendazole in it. Could I use that? It takes care of roundworms,Tapeworms,hookworms, and whipworms. They are granules of 22,2%(222mg/g). The dosage for canine is 50mg(22.7mg/lb) of body weight.
I use Valbazen, which is a little harder to find, more expensive in a larger volume, but it requires a dosage of 0.08 ml per pound (0.5 ml for 4-6 pound hen) once and again in 10 days. It treats most all worms, except for the more rare tapeworms. You can get it online.