I guess my dogs are weird, (well, I actually I know that) cause they only chew when we’re home with them. I leave Booda Velvets down for them all the time and the bones never move from morning until night. They usually start chewing after we’ve come home and had dinner and start to settle done for the evening. They NEVER chew when one of us isn’t home with them. Chester actually has to sit next to me on the couch, touching me while he chews. Yeah, we’re a little to close. Once we're settled, they get their choice of chewies other than Boodas.
I honestly don't know why I keep leaving them down for them every morning, knowing they won't be chewed.

Boodas and Kongs are about the only things that I would trust if my kids would chew while alone. Boodas don't swell and they sort of crumble like kibble, except it takes a ton more force to eat them than kibble. And they're totally digestible.