Real World article
(written from a Production point of view)

Referenced in the revised final draft script of the Star Trek: The Original Series first season episode "Balance of Terror", a terrier is a breed of dog.

In the aforementioned teleplay, a barrage of phaser strikes fired by the USS Enterprise were described as shaking a particular Romulan Bird-of-Prey "like a terrier," during the Neutral Zone Incursion of 2266.

Friday, a canine performer who portrayed Maura in TNG: "Aquiel", was a terrier mix.

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