Big is going on 8 years old, she is female and desexed. She is normally an outside cat and only comes inside during winter. She is one of four cats and is the oldest. She seems to hate all the others and freaks out as soon as they are close to her. She will eat with them however they aren't fond of each other. Big is especially skittish and while she is inside during winter she will continuously wee and poo on any clothing left in the bathroom or on the back door mat even though the door is open. Should we put a litter tray in the bathroom? She is extremely bipolar, she can be sitting lovingly on your lap and purring and the next minute lash out and jump away terrified. She can be sound asleep and suddenly jump up and run into the bathroom as if she is scared. She has skin problems but regular flee treatment seems to keep this under control to some degree however the two issues might not be related. She is missing a toe. Please Help.