Zombie apocalypse

You were calmly sipping your morning tea when suddenly you heard strange sounds coming from the street... Approaching the kitchen window, you saw people running in panic from... people? They were attacking others like wild animals... Chaos had broken out in the city... Rushing to the phone, you dialed your father's number; he was your only remaining family

• Dad... what's happening?... I'm scared...
  Dad: Stay home and don't let anyone in... do you understa—
  The call cut off abruptly
• No... Dad!
  Your father was a general. Tonight, he had left for another country on an important matter. Only his dog, Will, was at home. He was by your side, growling
  Friends... you had only four friends... Amanda, Rick, Max... you had problems with Max; you didn't really talk much, often bickered and fought... Today, you were supposed to meet at your place. And for a moment, the doorbell began to ring and someone started knocking. Will immediately began to bark. Remembering your father's words not to open the door for anyone, you became a bit worried, but upon hearing your friends' voices, you immediately rushed to the door.