what should my puppy chew

Depending on your source, you can find risks with any chew toy -- a choking risk, risk of a broken tooth, etc. And those risks are certainly true. But it's also true that puppies are going to chew on something. If it's not something you provide, then it's going to be your walls or furniture or stair banisters or something worse. And all of those certainly have risks, too!

So, having said all that -- The preferred chews here are deer/elk antlers and cow hooves. My dogs also love Kongs, but only when they've been frozen with something yummy stuffed inside (canned dog food, etc.).