In chapter 7
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The narrator remarks that the Duchess' dog's deserve tombstones as much as the average Christian.
She had a special graveyard made, in which to bury them when they died, and there they lie, about fifty of them, with a tombstone over each, and an epitaph inscribed thereon.
Well, I dare say they deserve it quite as much as the average Christian does.
Three Men in a Boat (To Say Nothing of the Dog)