Veterinary behaviorists, like me, see them often. There can be many different reasons for this aberrant behavior including crowding with too many other indoor cats, messy litter pans, the stress of nearby outdoor creatures, the list goes on. Our first job is to rule-out internal physical problems. An abdominal ultrasound of this 3 year old female tuxedo kitty showed the problem; bladder surgery removed it. There is no amount of behavioral treatment that can eliminate a bladder stone.