Moving from the city to a new house in the country can be tough. Just ask Henry, who can't find a playmate in his new neighborhood! Luckily, he's got Mudge, a great big, 182-pound canine buddy, with whom he can share all kinds of adventures! Henry discovers that having a pet is a big responsibility -- they need to be fed, they need to be taken out for walks, and of course they need lots of love and playtime! And when the dog is as big as Mudge is, they also need good training. Henry teaches his new friend to sit, heel, and shake his hand, but rolling over is one trick Henry just can't seem to teach Mudge, no matter how hard he tries. When Henry's cousin Annie comes for a visit, Mudge is so charmed by her that he finally rolls over at her command! Henry thinks Mudge must love Annie more than him, because the dog only does the trick for her. Very upset, Henry runs away into the cold dark woods to find adventures on his own. Mudge follow's the boy's scent into the forest -- he really does love Henry and doesn't want to be without him. Will the two friends be reunited? Find out in this Theatreworks musical, based on the best-selling series of books by Cynthia Rylant.