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How do we know if our pets are in pain? Today's latest Christmas guest editor - Oxford University Vice-Chancellor Professor Irene Tracey has been wrestling with that question. Professor Tracey is the proud owner of a four-year year old golden retriever called Mr Geoffrey Biscuits, who has experienced some problems with his joints. Her many years studying pain in humans made her wonder about our four-legged friends. So she spoke to Dr Kathy Murphy - the founder of Barking brains - about Mr Geoffrey Biscuits’ road to recovery. (Photo: Professor Irene Tracey and her golden retriever, Sir Geoffrey Biscuits)