What in the World Is Wrong with Gisbert? by Jochen Weeber

Gisbert is a giraffe.  He's excited about school, but the other students pick on him.  It makes him feel small...

Flyaway Books and Net Galley let me read this book for review (thank you).  It is being published today. 

Each nasty comment makes him shrink so he's no longer as tall as a giraffe.  His parents keep him home from school to find out what's wrong.  When he goes back, all the students have missed him.  And, pretty soon, he's as tall as he should be again.  Just talking about your problems can make them better.