Also, pooping on newspaper is one solution for the high rise doggy, living in an apartment block where getting outside just isn't practical. Alternatively, a senior citizen or a disabled person may find the convenience of a dog pooping on paper enables them to keep a dog, whereas the challenge of getting a canine companion outside might otherwise prevent this.
Whatever the reason, learning to poop on newspaper is a transferable skill, because the dog can be taught at a later date to go on a different surface or an alternative location.
In a young dog, you need to be aware of the limitations of the puppy's body, since he may yet have to learn bowel control and how to hang on. For an adult dog, bowel control isn't so much of a problem, and you may wish to add the refinement of teaching the dog to go on command. Again, this is super-useful when time is short and you need the dog to 'perform' ahead of your leaving for work or settling down for the night.
Whatever your need or reason for teaching a dog to poop on newspaper, know that success depends on how clearly and consistently you get the message across to the dog. If he is struggling and things aren't going well, then take a close look at what you're doing to see how you can be more consistent.
You will need a lot of newspaper (depending on the size of the room and your puppy!) so ask neighbors to save up their papers for you.