Dick King-Smith 
Magnus Powermouse [EPUB ebook] 

A very funny animal story by one of the nation’s most beloved children’s writers.Magnus is so big and so hungry that his parents have to find extra food for him. But perhaps pig-fattening pills weren’t quite the right thing as Magnus grows and grows and becomes a huge, fearless mouse, a real Power Mouse! But as Magnus grows, so do the problems he faces…