I found a puppy and I want to keep him but my mother won't let me keep him?

It's illegal and dishonest to keep a dog you found without doing the following. You need to take the pup to the vet's/animal shelter/animal control and have it scanned for a microchip. You need to go, door to door, in the area where you found the pup, to see if anyone knows it's rightful owner. You need to place ads in your local newspaper, as well as posting flyers in the area where the pup was found. To not do any of this would make you a not very nice person.