Originally posted on TIME:
With their tongues out, tails wagging, and hearts full of seemingly unconditional love, it’s easy to assume man’s best friend is happy by nature. But a new study suggests that, just like their human counterparts, certain dogs may see their bowls half empty.
It seems some canines are born optimists, while others are pessimists, according to the research from Dr. Melissa Starling, a faculty member of Veterinary Science at the University of Sydney.
To determine which dogs were happy-go-lucky and which were generally down in the dumps, the researchers set up a test: First, they taught the study animals to touch a target after hearing a tone associated with a more favorable lactose-free milk reward and refrain from touching the target after hearing a tone associated with plain water. Once the dogs…
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