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"I don´t know if anyone´s noticed," said Lord Eorle, "but you certainly don´t see as many dogs about as you used to."
Vimes stared. It was true about the dogs. There didn´t seem to be quite so many mooching around these days, that was a fact. But he´d visited a few dwarf bars with Carrot, and knew that dwarfs would indeed eat dog, but only if they couldn´t get rat. And ten thousands dwarfs eating continously with knife, fork and shovel wouldn´t make a dent in Ankh-Morpork´s rat population. It was a major feature in letters back home: come on, everyone, and bring the ketchup.
Ankh-Morpork seems to have a serious rat problem!