At our practice, to stop patients from developing mid/post op hypothermia, in addition to covering the patient in a blanket (apart from where the VS wants to operate on), we put baby socks onto their paws to help keep them warm.
The socks are just the cheapest toweling ones from the local supermarket, or few pairs donated from staff members who have had children...............but they work a treat! Our rates of post op hypothermia have dropped considerably since using them, even in dental surgery patients.
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When animals have had a dental and their face is wet, we dry them off with a towel and hair dry them. By combing their hair at the same time, it not only helps with normothermia, but also makes them look better to the client when they go home :)