In 'Of Mice and Men' why does candy say he should have shot the dog not some stranger?

because candy was so close with his dog and did not want a random stranger shooting it. he will feel guilty the rest of his life for not shooting his own dog, and should have taken that responsibility. he would have done any last touches like burying the dog and saying his last "goodbyes" but carlson will just throw him to some random place and not care.Also it shows the foreshadowing that is to come when george shoots lennie himself as curley would shoot lennie if not.