Surprising My Dogs With 400 Balls in a Ball Pit. My dogs have never seen so many balls, watch their reactions to getting 400 balls in a home diy ball pit. Our home was filled with balls, and my French Bulldogs had the best time ever. Haru usually doesn't like balls but she loved the balls in the ball pit. We loved this funny dog prank and surprise. My dogs had the funniest reactions to hundreds of balls, maybe next time we should try 1000 balls? What about 1000 tennis balls? What do you think?