Showoff

Showoff by Gordon Korman

From the book jacket:
Showoff: someone who is given to bragging, having a swelled head, boasting, swaggering, knowing it all...
Griffin Bing and his friends are back - and this time, things have gone to the dogs!
After former attack dog Luthor goes berserk at a dog show, he's accused of ruining the career of the three-time champion. Griffin has always wondered whether you could teach such a vicious dog new tricks... but he also smells a setup of some kind. he feels bad for Luthor - bad enough to spring him from the pound.
The only way for Luthor to make everything right is to do the unthinkable... and become the new national champion. Can Griffin Bing, The Man With the Plan, turn this beast into a beauty? Very soon, the whole world will want to know the answer.

If you can't get enough of the characters that Korman created for Swindle, Zoobreak and Framed, you'll be happy to know that the library just got a copy of Showoff. Dog lovers and readers who enjoy a fun sense of humor unite and enjoy another great book from Gordon Korman.
Booktrailer.