Koji has always been a poop eater, however, he used to eat it to hide it (because he'd poop in the house) and left it alone outside. I'm not sure how long this has been going on, but I noticed it more since we bought our house with a fenced in backyard. Except, now he likes to dine on the Maddie's poop (the Weim - much more poop than his own; I mean, why dine on a tiny piece of poop when you can have a large one? Ew). I started giving him a pro/pre-biotic for "digestive health" and well, unless that stuff takes a LONG time to take effect, I haven't seen any difference. At this point, I don't think it's behaviorial. And looking online, it could be anything. Thoughts?