Start feeding his raw meals out of the crate. The juices from the meat will be dripping all over the crate, and it makes it very hard to keep clean and bacteria free.
We do suggest very young puppies and older dogs (that have never been crated) to eat meals in their crates. This is for kibble meals. Puppies/dogs that are used to the crate (yours should be by now)...don't need to eat their meals in the crate.
Feed him outside, or feed him on a washable mat or rug...make sure he keeps his meat on the rug or mat. Outside feeding is much easier.
I think once you start feeding him outside of the crate, things will smell much better.
Gina