You learn to interpret their body language, growls, and whimpers after years together.

The study surveyed 18 dogs. The dogs' owners gathered a volume of their pet's tears. 

After collecting tears, researchers compared them to canines reunited with their owners after 7 hours. 

Dogs reunited with their owners shed 10% more tears than usual.

the researchers released 20 canines to non-owners. Dogs' tear volume didn't change when welcoming strangers.

This study shows that dogs, like people, cry after positive interactions. 

Dogs can perceive human emotions, but it wasn't known if they had bodily responses. 

Humans produce oxytocin, the love hormone. It causes amorous sensations and excitement

This hormone confirms that dogs cry out of happiness and love when they see their owner.

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