My dog will not stop eating rabbit poop

Hi! My 8yr Aussie male has been snacking on every single walk. We live in apartment complex with no sidewalks, so I walk him on the road and mostly on the grass. There are a ton of rabbits that live around here so I am just assuming he’s eating rabbit poop. I can never see it, he just shoves his nose in the grass and suddenly he picks up something and starts chewing away. It’s literally every 5 feet. It makes me so angry because I know he can get sick. At this point, I don’t even trust him - even if he is sniffing to pee. I swear he only goes outside to eat now. What do I do? Do I just let him eat it? I don’t know how to avoid it.