Our one year old large breed puppy ate all the chicken poop he could find after the girls would range. It made him gravely ill - extreme bloody diarrhea, vomiting, lethargy, severe weight loss, refused eating -- and this happened within a couple of days after cleaning the yard. After a vet visit and blood work, he required oral antibiotics including Metronidazole, Cerenia, 2 units of fluids for the extreme dehydration, and we had to wait for a compounding vet pharmacy in the NY area to ship us special oral antibiotics to fight the infection. His blood work did test positive for something chicken which I now can't recall as it's been a year ago. The vet told us to keep him away from the chickens and all their poop so I literally followed the birds around the yard and would pick up after them each time they ranged which means I literally had to follow them around and watch for them to poop. He has since stopped eating it now as an adult, not sure if age has anything to do with it or if he associated eating it with being sick. At any rate, the Vet said some dogs can become very ill, it just depends on the individual. Those chickens he ate after were also very sick, unbeknownst to us at the time, and all are now deceased. They obviously excreted something bad which he consumed. My advice, watch your dogs closely for any kind of ill reaction after eating poop, otherwise don't worry about it as the vet jokingly said it is a "delicacy" to a dog.