My Chihuahua, Chili died almost a year ago now from eating Greenies.
One got lodged in her esophagus and went it dislodged it choked her to death. Please don't feed Greenie to your dogs.
The new formula is only 3% more digestible than the old formula which killed I don't know how many hundreds if not thousands of dogs.
My Chihuahua was eating the "new" formula and the Vet had recommended it to us after we spent $300 getting her teeth cleaned. He said to fed her one a day. She got to #39 of a bag of 44.