Every couple of weeks and for two or three evenings in a row, our 8 year old tuxie has started circling. Her tail is up but she seems to walk in a circle as if she is being followed. She's eating well, drinking well, playing well - a little slower now she's older. She's an indoor cat but we always ensure she has plenty of stimulation and places to hide or perch and observe etc.
It goes on for a couple of minutes. She walks slowly and carefully in a circle and then seems to snap out of it and go about her normalness.
Any ideas?