My first reaction is what the heck are you feeding your dog?!?!!
I manage my dogs' feeding by inspection of their poops : if I couldn't easily and cleanly pick their presents up in my bare hands (but they have no difficulty squeezing them out), I am not feeding the dogs right!!
If the sheep's poop is just a bit sloppy as opposed to rabbit pellets, it is probably fine. In a given batch on decent grass, particularly when there has been quite a bit of rain, some will be making pellets, some will be more of a large soft single poop (maybe similar to a cake mixture? but not as sloppy as a batter...) Some will be in between (and closer to what
my dogs produce! lol). Anything that lands like a cow pat (splat! and spreads out like liquid : like a coating batter) is too loose.