Apple seeds in large moderation are toxic to most animals including dogs and birds. I already knew this (but thank you) I never use the core of the apple because lets face it, it's gross and doesn't hold many benefits. I only use the "flesh" of the apple and my birds did like it and my dogs of course loved the treats! I would recommend making them, they are so simple. It only took me 5 minutes to prep everything then I just baked them for 25 minutes and let them cool down. I also have lots of stuff left to make many more when the time comes to restock on them. So much cheaper than buying treats and you get more for your buck.