Calvin"s mom says his new dog Streak smells bad. Especially her breath. Calvin"s convinced that Streak"s stink is a good one, but he"s worried. If he doesn"t solve Streak"s problem soon, mom might make him give his beloved new dog back to the shelter. So when his teacher assigns his students a discovery project, Calvin decides to discover the worst stinks—and find a solution to Streak"s bad breath.