[Duckman]

If I had lost my dog, I would offer a reward which would encourage some people to return it. I am not sure of the amount (I would probably just put the word Reward in an ad).

If I found a dog, the joy of knowing the animal was back with its owner and off the streets would be reward enough for me. If someone insisted on a reward I would tell them to make a donation to a local animal rescue group or Humane Society...