喜乐蒂牧羊犬（英语：Sheltie），也称谢德兰牧羊犬（英语：Shetland Sheepdog），产于英国苏格兰昔德兰群岛。喜乐蒂牧羊犬属工作犬种，是一种在严苛环境中生活的犬种，主要担任赶羊群及守卫工作，是很活跃的牧羊犬。

The Shetland Sheepdog, also known as the Sheltie, is a breed of herding dog. The original name of this breed was Shetland Collie, but this caused controversy among the Rough Collie breeders at the time, so the breed's name was formally changed to Shetland Sheepdog. This small dog is intelligent, vocal, excitable, energetic and willing to please and work hard. The breed was formally recognized by The Kennel Club in 1909.