Animal science and behavior just added another 'Aha!' moment to what dog owners around the world already knew.

According to an article on news.discovery.com; "a study, accepted for publication in the journal Animal Behavior, presents the first experimental indication that domestic dogs rely on context-dependent signals when they growl at each other."

To some degree any pet owner who has heard their dog's low grumble at hearing an unfamiliar noise understands the difference in context between...
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