How many people would notice an alien species hair and scat though? Especially as it would look like dogs. Plenty of sheep and domestic animals are killed and eaten every year and the carcasses left. It's either unexplianed, blamed on space aliens, or the local fox and badger population. You hardly ever see badger prints even around a sett, so a big cat would go unnoticed by most and even if found, most people would consider it a dog print. The evidence of the possibility of them being out there is massive. Ian Maxwell and even RM have gone to certain areas and tried to track them. Both have gone on record and said they are definately out there.