Mine really don't seem to want to eat chicken poop. Weird, huh???
Though my first dog used to try for ktity crunchies, so we got a covered cat box to help prevent that.
But they do steal chicken FOOD if I don't hang the feeders up in the coop quick enough (neither of the dogs ventures into the coop without me there to protect them from Mr Red the rooster)
My Lab mix aka Mr. Can-I-Eat-That? even tried to eat some scratch one day - just coz the chickens were going crazy for it then it must be good, right? lol