When I watched this video, I reminded my old Shih Tzu that gone to heaven 6 months ago... Shih Tzu is the best and adorable Love for me💖 I miss everyday my lovely Shih Tzu so much...
Our animal doctor said that it is bacterial infection because his immune system gets weaker. He had cushing syndrome. Anyway, I think your cutie needs a doctor. I hope it gets well soon. (I am sorry if my English is wrong.)