
My 2 yr old schnauzer eats his if given the chance. He has done it from puppyhood. We had to watch him like a hawk and scoop it up before he could get to it. Then I tried covering a pile with curry powder and leaving it there. He didn't eat it, but it didn't stop him long term. Now, luckily he doesn't poo in the garden at all, but saves it up for walks which suits me.
However, our new pup doesn't eat hers, and our dog doesn't even try to eat hers either - much to our relief!
I think some dogs are just like this, unfortunately.