Four dogs rescued from the streets of San Paulo — named Frida, Mel, Costela, and Isabelle — had the very important job of retrieving tennis balls at a recent exhibition match in Brazil, reports CNN.

The dogs, not surprisingly, got a lot of attention from onlookers. The pups were trained before the event, and helped to promote the idea that rescue dogs can be trained well and can adapt easily to an adopter’s home.

Watch the video above to see all the highlights from the furry “ball boys” at the match.

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