Choosing the right size pee pad for your puppy is important to ensure that they have enough space to comfortably relieve themselves. As a general rule, the pee pad should be at least one and a half times the size of your puppy. For small breeds such as Yorkies, a pad size of 22 inches by 22 inches or 23 inches by 24 inches should be sufficient. However, keep in mind that puppies grow quickly, so you may need to adjust the size of the pee pad as your puppy grows. It's also a good idea to choose a pad with a plastic backing to prevent leaks and protect your floors.