Revealing mistake: When Louis goes to give Gage the shot, if you look closely, you can see that the needle is just a fake prop and doesn't leave a puncture mark.

Pet Sematary (1989)
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Directed by: Mary Lambert
Starring: Dale Midkiff, Denise Crosby, Fred Gwynne, Brad Greenquist
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Jud Crandall: How's your cat, Louis?
Louis Creed: It's Ellie's cat.
Jud Crandall: No. It's your cat now.
Trivia: George A. Romero was originally set to direct; but when filming was delayed, he dropped out, and Mary Lambert stepped in.
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Answer: Because in the book, the sign at the entrance to the "Pet Semetary" was written by some anonymous child. Clearly he/she couldn't spell that well yet.
Grumpy Scot