Cockers and springers where the same breed not so long ago. Out of a litter of pups the small dogs would be picked for woodcock shooters, hence cocker and the bigger dogs of the litter would be used for springing game, hence springer. A sproker is prob what the traditional spaniels looked like in years gone by. As for all the mongral comments. I'm a lurcher man originally so crossing breeds for gaining different attributes in the litter of pups makes perfect sense to me.