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There is a
in English that says a
is a man's (and woman's) best
. Dogs and humans have shared close and loving
for thousands of years. Scientists believe the
between humans and dogs is deeper than we thought. The scientists discovered that dogs cry
of joy when they see their owners after a period of
. The scientists conducted a small-scale study on 22 dogs. They tested the
of the dogs. In particular, they looked at how the dogs reacted when they were reunited with their
and with other people they had
contact with. The scientists said that when the dogs saw their owners, they cried.
