Cujo (Novel) By Stephen King review

This book is probably the most depressing book I've ever read. The story is about a who has to go on a business trip for the company he is working for which is a cereal company that's currently in trouble. His wife and son also have to take their car that's breaking down to a mechanic but what they dont know is that the mechanic is dead eaten by his dog cujo who has been bitten by a rabid bat and hes contracted rabies from the bat and is now a ruthless killing machine. The book is pretty good but i do warn that it is very depressing.