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Pugs usually have, and are bred to inherit, curly tails. However, in certain circumstances, a pug's tail may appear straight, such as if it is a newborn puppy or in its senior years, if it has an illness of some sort, if it is experiencing emotional distress, or if it was poorly bred. Having a straight tail would not make a pug too difficult to identify though, as pugs have several other distinguishing traits, including their flat muzzles and facial wrinkles.
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