The beat alternative for chewing is shank or marrow bones. If you are a person who cooks - buy a beef shank - use the shank and make a soup or stew for the human family's dinner. Clean the bone thoroughly and give it to Buddy. They are about as safe as anything there is for our kids to chew on. Here are a couple of pics.
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I would like to add that my guys have been chewing on them for a very long time. I have a couple of these shank bones that are at least a couple of years old - when they get dirty, I pop them in the dishwasher and give them a thorough cleaning. In all the time that the kids have been chewing on shank bones I have had to throw away only one of them because of wear.