When the weather is too hot for Happy Dog and his friends, they enter a contest to build the best walla-pa-doo -- a creation made out of junk -- and wind up discovering a way to cool off in the process. It's summertime and it's HOT.nbsp; The pool is packed.nbsp; There's hardly room enough for a shrimp, much less Happy Dog and Jack Cat.nbsp;nbsp; What can these two friends do to cool off?nbsp; Take matters into their own hands, that's what.nbsp; A little bit of junk here, a little bit of imagination there, and watch out!nbsp; It's walla-pa-doo time. Full of the bright, bold paintings for which Lisa Grubb is loved worldwide, this fun follow-up to Happy Dog! will leave young readers eager to craft their own inventions, and parents smiling at the result.