As far as the PJ comment goes, some dogs just need PJs. No matter how warm or cold your house is. My house is pretty warm, but Winston get's extremely cold during the night so he had to get a pair...lol. He looks rather funny in them, but they serve a purpose. If a dog get's too cold at night, they can develop kidney infections...well, it's common in Dobermans anyway. Not sure about sighthounds.
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