It is cute. I've seen lots of videos with guinea pigs getting into things with wheels and enjoying the ride. Guinea pigs are like every other pet in that they like some things and dislike others. For instance, some guinea pig owners dress their piggies up and they don't mind. It's okay to do that in such instances. My piggies hate it, so I don't make them do it. Some dogs love water and some don't. Bottom line is that if your pet; whatever species likes something or at least doesn't mind it, it's perfectly fine to do it. And it's probably very cute!