The boy threw the ball to the dog and it caught the ball successfully.

男孩把球扔给狗，狗成功地接住了球。

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If you spot someone interesting, discreetly throw a ball close to him or her for your dog to fetch.

如果你发现了感兴趣的人，悄悄将球扔到他或她近旁，然后让你的狗狗去捡。

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The equivalent of a blanket in the human experiment was a ball held in the mouth of a dog which was being observed (dogs often use their mouths to manipulate things).

人类实验中的毛毯的等效物是狗嘴中叼的球，旁观者可以看得见(犬类往往用嘴来操纵物品)。

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Every dog owner has helped her dog find a lost ball or treat by pointing in the right direction.

WSJ: Brian Hare and Vanessa Woods: The Secret Genius of Dogs

Tony Ball, spokesman for the Secret Service, said the dog that alerted security officers to a suspicious car on the White House grounds Thursday morning was trained to detect bombs only.

CNN: Canines patrol grounds daily

He was a dirt dog, he informed me, and he was going to get a ball.

NPR: Red Sox Game Locks in a Father's Day Memory