So my mom, Maura, got me tennis and raket balls when I wuz a mere 10 month old pup. I must haf had 12 balls. She wud throw thum and I wud sit and watch her throw them. She kept trying to get me to chase thum (I think she wanted me to bring thum bak to her.) I alwayz thought that wuz counter productive. Why throw thum if you want me to bring thum bak to the same place we started frum? If you want thum back that badly then I say don’t throw thum in the first place. Juzt hold onto my balls. I will say however that mom got good exercise by retrieving thum all the time. I am juzt not a retriever kind of dog. I certainly am not one to keep chasing my balls for nothing. Mom eventually “got it” and took away my balls. Now I miss thum.