I'm not sure why, but my dog would chew one of these and then throw it up within ten minutes or so. I'd put the bag away and forget about them, then come across the bag again a few weeks later and offer one to her - and have the same results.
After cleaning up after her for a third or fourth time, I had to just give up on these treats. I've never had this issue with my dog before, and it only happens with these chews. No idea why they don't agree with her, but the green-colored vomit on my cream carpeting makes these a definite NO for me.