ONLY once all health issues have been ruled out, should you then take steps to help stop the loss and prompt the coat to re-grow. If there is an underlying condition as mentioned above, these steps will only be temporary.
This said, there are some products that you can use to help.
1) Melatonin - This has been found to help, when used in conjunction with other methods (below). Please take note that while this can be purchased over the counter, it can make a dog feel sleepy. Check with your vet before giving this to your Shih Tzu.
2) Omega 3,6, 9 - This supplement is vital for healthy skin and coat.
3) Rescue lotion and hair stimulating shampoo & conditioner.
We highly recommend: