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in English says a dog is man's best friend. Dogs and humans have shared
relationships for thousands of
. Scientists believe the
between humans and dogs is
than we thought. They found that dogs cry with joy when they see their owner after a
of absence. The scientists did a small
on 22 dogs. They tested the
of the dogs. They looked at how the dogs reacted when they were reunited with their
, and with other people they saw every
. The scientists said that when the dogs saw their owners, they cried.
