Kobie and Eli both love fruits and veggies--apples are one of their all-time favorites, including the cores! There was a time when I'd have freaked out about their eating the cores, but I actually have met a person (i.e. human being) who eats the apple cores! He eats the WHOLE apple! I figure if he can do that without ill effects, the dogs are okay with it--just getting a little extra roughage!