There are some really great products that meet every requirement and go a step above.
For shampoo and conditioner, the Earthbath line is fantastic (see images below). Their Oatmeal and Aloe shampoo also contains almond and vanilla to create a super luxurious product that pampers every hair and is oh-so good for a Shih Tzu's skin.
If your Shih Tzu has any sort of skin issue such as dry or irritated skin (that does not need a medicated shampoo - more on that ahead), their Eucalyptus and Peppermint shampoo is amazing.
Another great choice for irritated skin is their Tea Tree Oil, which lathers a dog's body in both tea tree oil and
aloe vera for very fast results for soothing relief.
To go hand-in-hand with any of these superior shampoos is their Oatmeal and Aloe Conditioner. And one reason why this is so great, is that no matter which formula you choose for bathing, you have the added benefit of the oatmeal, aloe, vanilla, and almond to bring it all together for a super silky finish.
If you choose to take a closer look at our recommendations, the Oatmeal & Aloe will lead you to all of the wonderful formulas.
For a leave-in, one of the best is The Stuff. It's aptly named, because you will keep saying, "This stuff is awesome!" and "This stuff makes my dog look amazing!".
It is hypo-allergenic, smells great, helps prevent tangles, repels dirt & debris, and most importantly makes the coat look and feel incredible soft, silky, and healthy.
Another great one are those offered in the line of Nootie spritzes. These condition and moisturize exceedingly well. And, these come in some really wonderful scents including coconut lime, cucumber melon, Japanese cherry blossom, sweet pea & vanilla, and warm vanilla cookie.