Hi. If you use long-grain white rice (which is extremely low in sodium), you can create your own crunchy rice bones. Most dogs love them and they are unfattening, nutritious and healthy. Cook the rice, drain and press together into whatever shape you want, then bake until they are hard but not burned. Cooking for a longer time on a low heat is better, I find. You can also add natural flavors, but you should research those without sodium - and be aware the bones may have a shorter shelf life with some additives.
Tony
Welcome--I don't know what you have available to you, but most areas will have a Sweet potato Chew....Many companies manufacture them.....Make sure they ARE NOT made in China....Otherwise, this should be a fine treat for your guy.....
If you have The Honest Kitchen products around you, they make wonderful, healthy treats....My favorite are the Buffalo/Blue Berry Pecks.....Might check them out.....