Aurora® Adorable Miyoni® Tots Shih Tzu Pup Stuffed Animal - Lifelike Details Make a Cherished Companion - Perfect for Decorating Bedrooms or Classrooms - Brown 8 Inches

I'm sorry for your loss 💚 The only pre-made one I could find that looked close is https://www.thecookiecountess.com/products/tucker-the-shih-tzu-stuffed-animal but I don't know how the quality would be since there are only a few reviews. Like others have said, you can consider getting a clone made. If that's too expensive, you could also consider getting a regular shih tzu plushie like https://a.co/d/0h24jtKI and dyeing it dark brown with Rit dye. I don't know how evenly it would dye though. But just to give you a few options. I hope you get what you're looking for!