A Duck Hunter

A duck hunter took his new hunting retriever out on its first hunt. Soon he shot a duck that fell into the lake. The dog walked over the water picked up the duck and brought it back to his master.
The hunter was flabbergasted! He shot another duck. Once again, while he rubbed his eyes in disbelief, the dog walked over the water and retrieved the duck.
Hardly daring to believe what he had seen he asked his neighbour to go hunting with him the next day. Once again each time he or his neighbour shot a duck, the dog would walk out and bring the bird in.
The man said nothing and neither did his neighbour. Finally he could contain himself no longer and he blurted out, “did you notice anything strange about that dog”
The neighbour scratched his head and finally said, ‘Come to think of it I did, The son of a gun can’t swim.”