Well I think it's a smart idea, Paris isn't so sure of this one.
He has become a food gobbler since he lost his sight. I've read that it's because they aren't sure when their next meal will 'just appear'.
This morning I placed a golf ball in his dish and it really slowed down his eating quite a bit.
Here's the picture:
That's the 'after' photo. After he ate all the food!
I could use a bowl that you buy for food gobblers, but this was free and works just as well!