If I found a little dog that was lost, I wouild leave it alone because he probably will go home by himself. The owner will go outside the house and whistle or call the dog's name, and the dog would hear the whistle and run right back to the house. It's not a problem, usually.

In the US people usually hang a tag on the dog's collar. There is an address or phone number on the tag so you can return the dog to its family. If there isn't a tag, people who find the dog sometimes put up signs that say DOG FOUND and include a picture of the dog and your phone number.

I will bring the dog home, give some water, check for some name tag or chips and then start calling the Animal Shelter if somebody reported a lost dog or you report the dog that you found.

O oh...a good question,if i am in this situation...at first,i'll try my best to find his owner through some ways if it's just a dog got lost;...and providing that he's abandoned,surely i'll take care for it...i've been allowed by my parents to feed several cats and dogs abandoned before,so i think it does not a big problem if i have one more:):):)

Can you ask him to tell me the address of his house? I could walk him home, :）