Bertie Was a Watchdog by Rick Walton, illustrated by Arthur Robins is a book about Bertie, who is called a watchdog, not because he is mean, but because he is the size of a watch.  When a burglar comes into the house, he laughs at the size of Bertie.  They have a series of contests:  who can bite harder, whether Bertie can catch the burglar, and finally who can bark louder.  It is this last contest that finally gets the burglar into trouble, because he barks so loudly and so long that the police outside hear him. 

I enjoyed the manic illustrations of the book, and kids will enjoy hearing about a tiny dog that gets the best of an enormous man.  Definitely one to share in your next doggie storytime.