Hot Dog and Bob and the Seriously Scary Attack of the Evil Alien Pizza Person — L. Bob Rovetch

This is Bob.
He's just an ordinary boy with ordinary friends who goes to an ordinary school every single day. But this is no ordinary day.

Today when Bob opens his lunch box, he finds Hot Dog -- a real, live,
talking hot dog! -- sitting right there on his pizza slice. Hot Dog says he's
from another planet. He's here to save Earth gulp -- he needs Bob's help! Hot Dog says he and Bob are partners till the very end. The only question is ...the very end of what?