This ball machine was built for Jerry the dog by his owner because he thought that this is fun to build and the dog would enjoy it.
It took him about two years, but it came with many safety features such as proximity sensors to protect his son and the dog from the machine.
Jerry was surely enjoying playing with his machine.
[embedyt]https://www.youtube.com/watch?v=4PcL6-mjRNk[/embedyt]