Well I'm glad I'm not the only one. We have lots of jokes about it, 'the dogs are eating popcorn again', the chickens are 'popcorn machines', the dogs are 'vacuuming the lawn again'.
Regarding the nausea, I can say that one of my poo eating dogs has food allergies, and he has mild allergic reactions after he feasts on chicken poo. Chicken food is unfortunately LOADED with the things that typically trigger food allergies in dogs - soy, corn, wheat, grains, etc.
I have found no other solution other than keeping the chickens (mostly) away from places that the dogs have access. I allow a little poo eating as long as the allergies don't get too bad.
My vets have also told me there is no harm in the poo eating, other than monitoring the allergic reactions.
Good luck, and don't let him lick your face!!
Colleen