Dogs can become less sharp with age, adopting behaviours such as pacing and staring into space

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Separating a potentially effective drug from background noise is a challenge in any medical field, but perhaps particularly in the much-publicised longevity industry. In one of its most recent ventures, researchers have claimed that a supplement given to ageing dogs can reverse some of their cognitive decline. But before dog owners start wagging their tails with delight, some researchers are concerned they could be barking up the wrong tree.

Katherine Simon and her colleagues…

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