A. Even if things seem room-temperature to you, greyhounds have very little hair and may still get cold. Adding in a sweater or doggie coat may help him to feel a little more comfortable. You may also want to add a blanket to his bedding to snuggle under as well. Teeth chattering may also indicate nervousness or stress, and if you've had recent changes to your home (such as new people or pets) this may be a cause as well. Providing a place for him to rest away from all the commotion may help.
If you are seeing any other signs of illness in addition to the teeth chattering such as drooling, vomiting, diarrhea or lethargy, then alerting your vet is best.
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