Had to put a Hob down

[Moochersways 244]

Went out to feed the ferrets today and one of my hobs was acting very strangely, couldn't walk in a straight line, banging into the hutch walls, rolling around ect, head tilted one eye slightly bulging, my first thoughts are some kind of stroke? Or head injury.....maybe falling down the ladder in the hutch(not a great height tho) anyone experienced anything of the like? Seemed fine yesterday when I cleaned out and fed them (on dry kibble atm) and apart from that he seemed in good condition, all the other ferrets are lively and fine, I put him down as didn't want him to suffer shame as he was only around 6 years old, anyone have any other ideas what it could be or experienced anything similar?

Cheers