I watched Sassy crack an old formula Greenie and swallow a huge piece. She was quite uncomfortable a couple days later as she passed it whole. Guess I was lucky it went through, the old formula hurt some dogs. Watching might not be enough at least if you are as slow as I was.
Kongs. Good to chew on and if you really need to fun to stuff for a long workout. I search out and buy any natural rubber toy I can rub a bit of peanut butter on or put some food in. Great exercise and fun for the dog.
Usually you need vast numbers of chewies to get just the right one. Sassy enjoyed rope chews, the oldest toy I have is a 10 year old rope from a Costco Christmas dog stocking. Again, don't leave puppy along with it, could chew off a lot of strands and swallow them.
I haven't given them to my dogs but one of the newer things is natural deer antler. They are supposed to soften up when chewed on but not break up. They cost a lot and reportedly some old ones will break up.
Bully sticks are safer than rawhide as they are just dried rather than cured in nasty stuff. I like giving cow ears as they aren't greasy like pig ears. Sassy loves dried beef trachea, I think she likes that her chewing is amplified through the hollow tube! It really breaks up fast and doesn't last long. There is a mixed bag of treats that my dogs like. Lots of tendons, tail tips and ears.
I always bought the largest size chewie I could. It is super cute seeing a dog chewing on something too large and if it is consumable it lasts longer before you have to throw out the too small choking/swallowing hazard. As in I buy 12" bully sticks and toss when they are taken in the mouth at about 4". If I bought 6" bullies the dogs would get 2" before I remove them, 12" they would get 8". For two 6" bullies I would toss out 8" but for that 12" bully I would only toss 4".