Personally I doubt very much that any size of a dry dog food, unless it's as big as the dog's head, is going to encourage the dog to chew.. a dog's teeth are not made to chew, they are made to rip. Has anyone's dog ever thrown up after eating? The dried food is still whole usually..
I think that Royal Canin's claim and 'breed specific' food is just a marketing campaign, honestly. If you are afraid of your dog eating too fast and contributing to bloat, you can feed your dog off of, for example, a wide cookie sheet. Spreading the food out will slow consumption. If you are in the US, you can also try a BrakeFast bowl.
