A shelter dog specially trained as a ball-retriever catches a tennis ball during an exhibition event at the Brazil Open tournament in Sao Paulo, Brazil, Saturday, March 4, 2017. Wearing blue bandanas around their necks, specially trained shelter dogs showed off their talents shortly before Joao Sousa of Portugal met Spain's Albert Ramos-Vinolas in the day's first semifinal match. (Photo by Andre Penner/AP Photo)
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