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There is a saying in English that says a dog is a man's (and woman's) best friend. Dogs and humans have shared close and loving relationships for thousands of years. Scientists believe the bond between humans and dogs is deeper than we thought. The scientists discovered that dogs cry tears of joy when they see their owners after a period of absence. The scientists conducted a small-scale study on 22 dogs. They tested the behaviour of the dogs. In particular, they looked at how the dogs reacted when they were reunited with their owners and with other people they had daily contact with. The scientists said that when the dogs saw their owners, they cried.
The researchers, from Azabu University and Jichi Medical University, put strips of paper under the dogs' eyes. They then checked to see if, and when, the dogs cried. The scientists found that when the humans and dogs were reunited after five to seven hours of separation, the dogs shed tears. Researcher Takefumi Kikusui said: "We had never heard of the discovery that animals shed tears in joyful situations, such as reuniting with their owners." He added: "Their tears might play a role in the deepening of mutual relationships." He believes the tears may make humans love their dogs more. He said: "It's possible that dogs who show teary eyes during human interaction would be cared for more."
- Who does the article say are men and women's best friends?
- What do scientists think is deeper between dogs and humans?
- How many dogs were used in the study?
- Who did scientists test dogs with besides their owners?
- What did the dogs do after seeing their owners after an absence?
- What did the researchers put under the dogs' eyes?
- After how many hours' separation did the dogs cry?
- Who is Takefumi Kikusui?
- What might deepen mutual relations between dogs and humans?
- What might happen to dogs if they are more teary eyed?
Back to the dog tears lesson.