When a Pug is running in a mad frenzy, the tail will uncurl.
Running in a mad frenzy requires complete concentration and muscle focus. Thus, the tail's resources must be shut off momentarily as resources are diverted to other muscles. This has been your Pug Fact of the day.
Wow, so it's like when the Enterprise has to divert all its energy to the shields to fend off a barrage of enemy fire!
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