Slinky acts very much so like an actual dog. This concept, as well as Slinky's overall demeanor, was changed after the infamous Black Friday viewing of the film that resulted in it receiving an extensive redo. Eventually, after Woody not only attempted gruesome but formerly against Buzz Lightyear, as well as being severely insulted by Woody when he hesitantly spoke up against what Woody did, he turned against his former master by telling the other toys to throw him out the window just as he had done to Buzz. According to Woody, the only reason Slinky wasn't hauled off to Goodwill, much less is actually played with by Andy, was because of Woody. Slinky was originally depicted as a long-suffering, abused right hand of Woody, and was also one of the most unpopular toys among Andy's collection. During rewrites, the character was changed to a dog, most likely to be more appealing.

He is rescued from a toy collector and joins the main protagonists on their adventure before ending up at a kindergarten in the end.

The earliest draft of Toy Story featured a slinky caterpillar who had never seen a child before.

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