Mainly because I know Cujo was played half the time by a man in a dog suit. π€£π€£π€£ Obviously they used a real dog for establishing shots but the times when the dog is like ramming the car and stuff, it's a man in a suit. I found the stuff with the child actor more questionable because, I swear, that kid looked really traumatized at times. No four year old is that good of an actor. He was legit screaming and crying at times.
Movie spoiler
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Tad doesn't die in the movie. He's revived at the end by his mother. When they made the movie, they told Stephen King they were changing the ending and letting the kid live and wasn't sure what his response would be. He replied "You better or the audience will come for you". π