My chickens don't peck thru dog poo..but they will scratch thru the compose pile where I have bunny and horse poo.. I think they are looking for fly larva and seeds that have pasted thru...
oh ok but since my dog doesnt do that i guess there's no reason to. although he eats lots of fruits/veggies. i can gather rabbit poop from the front yard and give it to them.
My dogs join the chickens when I toss scratch grains onto the patio. At the risk of sounding too graphic, the chickens only peck through the dog poop that has scratch grains in it.
I have since learned to either supervise scratch snacks so the dogs don't eat it too, or give it to them more discreetly.