Dogs that guard resources, snap and appear grumpy may be more easily trained by a stranger than their happy-go-lucky counterparts, researchers from Eotvos Lorand University reported in Animals. Grumpy and agreeable dogs performed about the same when shown by their owner how to complete a task, but grumpy dogs performed better than agreeable ones when taught by a stranger, suggesting they may be more attentive, although some dog behavior experts questioned the findings.
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