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In page Greyhound:

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A common misconception regarding Greyhounds is that they are hyperactive. This is usually not the case with retired racing Greyhounds.[8] Greyhounds can live comfortably as apartment dogs, as they do not require much space and sleep almost 18 hours per day. Due to their calm temperament, Greyhounds can make better "apartment dogs" than smaller, more active breeds.[citation needed]