Carl used to eat really really really really really really really really fast! He still eats fast, but he's not so bad anymore.

We tried the ball in the bowl thing and he just pushed it out.

We discovered he only eats really really fast if he is really hungry. He used to eat once a day, so by the next day when he got to eat again, he was really hungry - the result, he ate really fast. So we cut his meal in half and gave half in the morning and half at night.

We also feed him in his crate in another room with the door closed. This prevents him from worrying that someone else is going to come in and eat his food.

He doesn't eat "slow" now. But at least he chews.