There are a couple of care elements to take note of.
1) Hygiene for your Shih Tzu and cleanliness for the house.
Though the amount of discharge will not seem like very much, and often is not even noticed if you are looking at a dog, it will accumulate.
This will cause hairs on her rump to stick together and bloody discharge will soak into bedding, furniture, and any other porous surfaces that a Shih Tzu sits, rests, or sleeps on.
For these reasons, there are 3 things that you will want to do:
Gia, 1 year old
Photo courtesy of owner: Mary