Danny used to love running, riding, playing and climbing. Until one day when a branch in his favourite tree breaks and he suffers a terrible fall. The kind that means Danny will never run, ride, play or climb again.
 
But then, Danny’s aunt brings him an unexpected present. It’s a puppy from a dog refuge that no one wanted. Danny doesn’t want the puppy either at first. After all, what good is a puppy to a boy who cannot play with it?
 
Except that something miraculous happens. Danny’s new dog doesn’t stop growing. Soon, it’s as bigger than a horse! Which is when Danny’s inventor father has the most wonderful idea. The kind of idea that might just change everything.
 
There’s just one problem. When, some very bad men hear about Danny’s giant dog, they want it for themselves.