My sheep just pooped in my living room and not far off there was a black slug like animal. I can only presume it came from her poop as I was just cleaning up some sheep poop and went to the kitchen to put away the paper towels. I came back and found a small pile of poop and then about 4 feet away was a black slug that wasn’t there moments before. Can this be a worm/parasite I need to treat? Or was this most likely a slug she swallowed that somehow managed to not get digested and just got pooped out?