Here is a short video of what my dog Cricket’s circling behavior looked like.
Circling can be very obvious once the dog has an advanced case of dementia, but it doesn’t necessarily start out that way. Cricket was doing it for several months before I noticed. At the beginning she didn’t stand in one place and do it; her circling was integrated into how she walked around. When I would see it I attributed it to other things.
Circling can also be a symptom of several other diseases and conditions, so if your dog has started to circle or shows other oddities in her gait, please take her to see your veterinarian.