I think that most people do try to do there part in keeping the CG clean, but there are always that few that will not care at all, it's like it is figured in there CG bill. I watch people let the pets do there duty and dont pick it up. along with many other dirt bags that dont care.
Oh by the way pigs are a clean and a smart animal. the mud is to keep them cool. example Green Acres that little white pig.
on edit I changed bigs to PIGS that sliped by my old eyes. LOL