You can train a puppy to use an outdoor toilet from 3, or better 4 months, when the animal has received all the planned vaccinations. At first, you will have to take out the dog often, since the puppies relieve themselves every two hours. Stay in the fresh air as long as possible so that the animal has time to fulfill its plans. Usually they go for a walk right after sleeping or eating. For more motivation, you can bring a diaper with you, on which the puppy is used to urinating at home. If the number with the diaper does not work, find a place on the street where other dogs have previously done the toilet and bring the puppy to it. Usually, Chihuahua is inspired by the example of relatives and sits side by side.