10. Shih Tzus are Brachycephalic
Shih Tzus are what is called brachycephalic, meaning that they have a shortened head. In particular, the breed was created to have an unnaturally shorten nose to get that oh so cute look. Unfortunately, that look can cause breathing problems. Shih Tzus can overheat quickly because their noses can't get enough cooling air into their body, especially if they're doing physical things, like running. They are more prone to allergies and infections due to their shortened noses.
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