Is your dog jumping on people?

Why does any dog jump on people? Could it prove dangerous? Can you ignore that? Do you think it will become a problem later on?

A dog or a puppy that develops the habit of jumping on people can get you into embarrassing and annoying trouble. This habit might turn out to be exponentially dangerous if your dog is bigger in size, because he might accidentally knock you down. Not to mention he will get your clothes dirty with mud, dust, etc.