3. Give them a new toy

Normally, Shih Tzu nature is on the curious side, but if they are confused in the mind, most probably, they will avoid the toy.
4. See if they are barking at you

This means that they want to convey something. It is their gesture to ask for attention. So, you know what to do then!
If you are confusing your Shih Tzu, then change and mend your ways now! Woof Woof love!