How do you get your dog to hold tricks in nintendogs plus cats?

To get your dog to hold tricks in Nintendogs + Cats, start by training them with specific commands using the stylus or microphone. Reward your dog with praise and treats when they successfully perform a trick. Consistent practice and positive reinforcement will help them hold the tricks longer. Additionally, make sure your dog is well-rested and in a good mood to improve their performance.