Harold and Chester can hardly believe it -- the Monroe family is going on vacation without them! No sooner have Harold and Chester settled into their bungalows at the Chateau Bow-Wow than Louise, a French poodle involved in a messy love triangle, disappears. All Harold and Chester know is that in spite of themselves they have entered the crime-detection business and neither foul play nor foul weather can stop them from finding out whodunit!

--- Added from Google Books ---

The Monroe family pets, Harold and Chester, are boarded at Chateau Bow-Wow. While at Cheteau Bow-Wow, Louise, a French poodle disappeared. Harold and Chester try to find what happened to Louise.

--- Added from Hardcover ---

Not a great place to visit, and you wouldn't want to live there The Monroes have gone on vacation, leaving Harold and Chester at Chateau Bow-Wow—not exactly a four-star hotel. On the animals' very first night there, the silence is pierced by a peculiar wake-up call—an unearthly howl that makes Chester observe that the place should be called Howliday Inn. But the mysterious cries in the night (Chester is convinced there are werewolves afoot) are just the beginning of the frightening goings-on. Soon animals start disappearing, and there are whispers of murder. Is checkout time at Chateau Bow-Wow going to come earlier than Harold and Chester anticipated? ([source][1]) [1]: https://www.jameshowe.com/books-1/2014/5/1/howliday-inn