A dog playing with a duck

This is hilarious! This dog loves tennis balls, he loves to play with them and grab them with his teeth. A local tennis instructor delivers 300 used tennis balls only to make this lovely pooch content and well-exercised. Is'n this nice? When one tennis ball falls onto the ground, the dog immediately grabs onto it, he has so much energy and excitement after seeing the ball, so funny! Then something crazy starts to happen, a few more balls start to land on the ground, and this dog can't believe it! What is going on? Where are all these balls coming from? He can't contain all this excitement! Is this what they call dog's heaven?