you're a kid (6-8 years old), one day you recollect the dragon balls, but Shenron can't fulfill your wishes since you were a minor, so in return he let you keep him like a pet (it is necessary to clarify that he changes his size to a little dragon) One day the Z warriors (and Whis and Beerus) found you walking Shenron through a park where almost no one thought it was strange for a person to walk their dragon apparently

Z warriors: speechless

Whis: speechless but eating

Beerus: the same that Whis