Can Cavalier King Charles Spaniels hunt rabbits?

Answer 1

That is not what the breed was intended to do but, every dog is different in traits. It is very possible that any dog could learn to do certain things but some just have it inbred in them to do certain jobs better than others. Dog Breeds better suited to do that would be Beagles or possible Basset hounds.

Answer 2

I have a cavalier and hunt pheasants with him. He has limited hunting training and has developed mostly through actual hunting. He works close and is very birdy, but is limited by size in certain terrain. I would say cavaliers can hunt, but are limited by their size and of course training has an impact.