Theodore's Dog - S1.E17

Theodore finds a dog (Alexander) at an animal shelter and drags him home. Theodore tries to convince Dave to allow a dog to live with them, but he says no since they travel too much. Desperately wanting a dog, Theodore hides Alexander in the basement; when he escapes, Dave believes there are burglars and he calls the police. Dave becomes angry when he finds Theodore's been hiding the dog, but his brothers convince Dave to take him on their trip.