My belief is that bunny poop is not all that dirty. Their principal gut bacteria is a bacteria that transforms cellulose to glucose. This is the bacteria that lives in their cecum stomachs. You get this bacteria on your hands and ingest it, it isn’t going to cause you any problems. On two occasions, I’ve scooped up bunny poop pellets in my hand and smelled them. There is no fecal odor. Bunny poop has a herbal smell to it with a onion or slightly sulfur overtone to it. Rabbit poop is known to have a residual protein content to it. When we first got Bunny, a rescue rabbit, our grandson had a hamster.. We put the hamster in the rabbit’s cage. Bunny licked the hamster as if it was a baby bunny. The hamster kept itself busy eating bunny poops. I really don’t think your dog will be harmed by eating bunny poops.
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Cellulose is a long poly saccuride molecule. If you snipe it off at the correct short lengths, you create glucose. The bacteria in bunny’s cecum stomach cut the cellulose molecules into the short lengths to create glucose. The cecum bacteria live on the glucose they create and the excess glucose they create feeds the bunny. That’s why your bunny can eat grass hays.