The Last Dog on Earth — Daniel Ehrenhaft

Logan Moore hates everyone. The father who abandoned him. The stepfather who wants to control him. Kids who get in his face. Everyone.

Except Jack. A mangy mutt that nobody wants.

Except Logan. But Jack is in terrible danger. A mysterious disease is sweeping across the country, turning dogs into vicious, raging predators. Jack isn't infected, but that won't keep her safe. People are shooting dogs on sight and asking questions later. Now Logan and Jack are on the run. There's nowhere they can turn and no one they can trust.

Except each other.