I have a 4 month old ACD pup that will spin in circles,to her right only, until she falls down and her legs will still be running. She is full of engery and dose not do this all the time but enough that my husband is very worried that something very bad is wrong with her. We take her to the vet faithfully but he has not asked our vet guess he is scared that she will be needing additional help of some kind to over come this circle running.
You have to talk to your vet about this. You never know it could be nothing but at least bring it up to the vet. You could be sorry if it is something serious that could be addressed and you wait to long. vetcare