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From Wikipedia: In the series, the Hino family picks up their "little brother" from the airport. The "brother" turns out to be Rilienthal, an intelligent dog who speaks Japanese. He is also the target of men in black suit from a mysterious organization. They refer him as RD-1.
聪明的狗狗莉莉安塔尓 賢い犬リリエンタール Kashikoi Inu Lilienthal Kashikoi Inu Ririentaaru Kashikoi Inu Ririentaru Kashikoi Ken Lilienthal Kashikoi Ken Rilienthal Liliental Lilienthal Rilienthal Ririentaaru Ririentaru Super Dog Rilienthal