When I got my first piggie some 11 years ago he had been dropped - apparently did a 'backflip' - cos they do that all the time don't they rolleyes
Anyway, although he had feelings in his back legs he couldn't move them. After starting a course of anti inflammatories he began to have some movement in one leg but dragged the other so I used to put him into a shallow warm bath and have my hand supporting him initially them start to move it a small way away and he would swim after it. He was only in for a few mins every day but he was never frightened or worried and I actually thing he enjoyed it. He gradually got full movement back and was fine eventually

I would never leave them unattended or in water too deep but I think its like all things, some will hate it and some will like it

p