My brother (Age 8) has run away ?!?

Okay first- take a deep breath, your son will be fine- dogs are very protective and they have good instincts to get back to the house. And yes, im sure the dog will bark. So just sit tight and wait until he's found. No 8 year old that I know of would spend the night outside so if he isn't found by the police, I'm sure he make his way back with the help of the dog. As for moving- not the only option, try counseling and telling the school about the bullying situation. Just keep your cool, I'm sure your son will be found!