There are many reasons you might want your Chihuahua to learn how to use a pee pad in your house. Chihuahuas are little dogs, and they don't typically handle winter weather very well. Pee pads are perfect for little dogs to be able to use the potty in one area in your house, protecting your floors and furniture, curtains and walls from urine damage and marking. Training your Chihuahua to use a pee pad could occur because his little body is too small to handle the harsh winter cold and his little paws are too sensitive to handle cold or icy conditions. Many Chihuahua owners also train their dogs to use pee pads if they are living in apartments. High-rise buildings in the middle of concrete cities don't offer soft, comfortable grass and places for your dogs to go potty outside. For larger dogs, it might be worth walking to a dog park and getting exercise to find some grass. However, for small dogs like Chihuahuas, it makes sense if you are in an apartment in the middle of a concrete jungle to potty train your Chihuahua within your home.
Training your Chihuahua to use a pee pad is not much different than house training your dog. You were going to take him to the same place anytime you think he needs to go potty, so he knows exactly where to eliminate. You will need to keep pee pads clean and changed frequently so he has a clean, sanitary place to go each time he needs to go. Be patient while you're training your Chihuahua to use pee pads. He may have some accidents here and there in other places. Be sure the area where you keep your pee pads is accessible to your Chihuahua, not hard to get to, and a place he can visit on his own often. It's easy to train Chihuahua puppies to use pee pads, but you can train your older dog to use pee pads as well if you are rescuing or trying to change the potty behavior of your older Chihuahua.
Be prepared before you begin training your Chihuahua to use pee pads. Stock up on the pads you plan to use so you have plenty on hand while you're training your dog. Get some high-value treats for rewards to give to your Chihuahua each time he is successful using the pee pad instead of going elsewhere. Set aside space just for your dog. This space needs to be the same space each time. Do not confuse your dog by moving pee pads around your house. Before you begin training, scope out an area that you plan to use for your dog all the time. The space to be stocked with pee pads, and your dog needs to have access to it. Spaces many families use are bathrooms, utility rooms, closets, or unused rooms.