[Smeagle]

I would look at teaching him control when he's around the ball.

If it were me, I'd be taking the ball and putting it away and only taking it out when I was doing training with him. I'd be doing lots of short training sessions each day where I used the ball as a reward, so he had to work for it.

When a dog is obsessive like that you need to put the control back in and teach them that they get the ball on your terms and your terms only.