I have multiple kitties, all who have 24/7 access inside and outside. I put in a doggy door so they can come and go as they please. However, my cat Edgar decided to come inside for the night and I woke up to him digging at my blanket and I notice he was pooping on my blanket. He is healthy, utd on his shots, has access to both litter box and outside. He doesn't normally like to be inside. His poo also stinks really bad. It was between normal and runny. I had trouble cleaning it up. he's the offspring of one of my other cats so I've had him since he was born and never had this issue.