Despite its small size, the Chihuahua, like all dogs, needs exercise and training. The amount of energy an adult Chihuahua has can be amazing. He will endlessly chase squirrels in his backyard and play as much as you do. Chihuahuas love walks, supervised noisy games in the yard, and looking for toys. They will walk until they fall, so it’s important to make sure they don’t tire out, especially on hot days.