When choosing the perfect shampoo for your Chihuahua, you have only two points to remember. You want the shampoo to be made specifically for dogs and in a tear-free formula. Dogs have a different pH to their skin than we do, making human shampoos too harsh for a dog's skin. The necessity of a tear-free formula is that try as you might, there will come a day when you will get some soapy water in your Chi's eyes. If you are using a tear-free product, the effects will be far less uncomfortable for your dog.

From there, the sky's the limit as far as shampoos are concerned. You'll find shampoos specifically to make white coats white, black coats black, itchy skin not so itchy, dry hair moist, and long hair luxurious. Specialty formulas may be more expensive, but if you'd like to give one a try, go ahead. (You don't need a large bottle.) Again, as long as the shampoo is for dogs and is tear-free and you like it, then it's a good product.