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Phineas L. MacGuire (a.k.a. Mac) is less than up-to-date on planetary happenings. (Marsquakes? Who knew?) If he's going to be the best scientist in the fourth grade, Mac has to set his sights pretty high. To outer space, actually. But Space Camp is expensive. Where is he going to find enough money for a week on Mars (or a pretty close simulation thereof)?
Houston, we have another problem: a gigantic, slobbery dog named Lemon Drop. Mac can earn the money he needs by walking Mrs. McClosky's yellow Lab, but first he needs to survive the walks and the slobber! Good thing Mac is a scientific genius with friends like Ben and Aretha. Together the three of them discover that Lemon Drop is no ordinary dog -- that Lab is a real-life Lab-oratory.