A collie was a type of dog.
When the crew of the USS Enterprise was trying to convince the cosmic cloud not to consume Earth, images from the ship's library computer were shown to the non-corporeal lifeform, and one of those images showed the silhouettes of children running in the country with a collie. (TAS: "One of Our Planets Is Missing")
The collie was none less than Lassie, star of Lassie's Rescue Rangers, as the images were re-used footage from that show.
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