I bought a bag of 18 large (Can be broken in half to make smaller sized ones) Nylabone natural nubz at Costco today! They were only 5$..I thought that was extremely cheap, as they are 6.99$ at PetSmart for TWO!! They are supposed to be extremely digestible. They are dental chews... What do you think of them? I get worried when I feed them treats like that since Greenies have been proven to cause intestinal blockages! But these are much softer than Greenies.