According to King’s memoirs, he was completely drunk when he wrote Cujo and has no recollection of having written it.
Wouldn't surprise me.
Goes to show how much talent King really has. No one in the horror genre even approaches King's ability to spin a yarn. Even his worst stuff is heads and tails above most anyone else, Koontz included, though I like Koontz. The Stand is one of the greatest works of fiction ever written IMHO.