I think that the Nylabone "greenie" knock-offs probably have the same risk as a greenie, I don't see how it would be any different.

I agree that there are a lot of thing that are much more of a threat to a dog than a greenie or a Nylabone. I feel much better about about feeding a greenie or Nylabone than a rawhide or other kinds of chews.

Not only are rawhides not digestible they are often full of salmonella, also some rawhides are made containing dogs and cats in them.

I think the hype about greenies and greenie-like products are blown way out of proportion. Why are rawhides so accepted? Why aren't there warnings all over the news about them? The English philosopher, John Loche said "New opinions are always suspected, and usually opposed, without anyother reason but because they are not already common". I think that applies to products as well as opinions.