...they sound like a better choice than rawhide.
What's different to these than rawhide (besides the claim that they're digestible)? LOL - they're still the chemcially-treated cleansed hide of some animal, otherwise known as leather. In this case, pig leather rather than cattle leather. Pig leather makes equally durable coats, shoes and bags as cattle leather...
As a chew for dogs, they're going to present exactly the same toxic chemical problem, and exactly the same choking hazzard as any other chemically cleansed and dried body part. It will present the same bacterial poisoning risk also. If the marketing claims are right, then you've only a 5% chance of obstructions (which can be fatal, btw) because the dog will digest the other 95%. LOL - that last isn't exactly accurate, of course. But really, you're just talking about another un-natural and
not fully digestible man-made chew item that your dog doesn't need, isn't designed to consume, and that carries with it risks to his health.
Much safer are the things nature designed the dog to chew on (raw bones). Or NON-EDIBLE man-made items, such as kongs or nylabones.