Hi Mightyhogs,
as far as I’m aware, no formal research has been done into this. Part of the issue seems to be that it isn’t witnessed very often. Do you, per chance, have a video?
As Nic has already mentioned, early suggestions included some inner ear imbalance or poisoning. More recently, Amazing Grace Rescue was featured on the Saving Britain’s Hedgehogs mini series and they have apparently found infestation with ear mites can cause hogs to run in circles. Hence, I would echo Nic’s suggestion that it would be good to get the hog to a carer to be checked over if at all possible.
Cheers,
Marc.
