Very cool! Thank you. Where would one get these balls? If done simply as a "hobby" could you use any balls bigger then the dogs mouth?

I am thinking of using this as a way to hone my dogs herding skills when we can't get to sheep. A fun way to tire the dogs and learn directional type commands. smile
Heroes Refuge

Jethro and Keyzah

My Angels forever in my heart and watching over us:
Phoenix 9/28/07
Kaylee Cheyenne HCT 5/25/09
Chimo 3/2/10
Lakota 8/27/11
Kanuck 11/2/11
Rayne HCT 6/3/13
Tika 12/28/13