Another danger is that both Opossum and raccoon will leave feces ON hay and it's really hard to tell the difference between the two
For the first time in nine years, this summer, I threw out $20 worth of hay because of that. I haven't seen any traces of anyone since then, so I'm hoping my barn cats were enough of a threat the critters kept on the move.
If the opossum is relocated, it needs to be done miles and miles away. I tried that trick several years back --- took it almost two miles away ---- found it dead on the road a few days later, less than half mile from my farm
I know it was the same one because it had a distinct marking on its head - one of the farmers had hit it<---better them than me because I can't kill anything, I just "relocate them" and it didn't work in this instance.
If there's a baby, there's a mama somewhere and maybe some brothers and sisters.
They don't need to be "gone" ----------- they need to be "long gone" for the safety of all the horses.