How old is Buddy? It's possible that if you've moved recently that it could stress him for a few days. Have you soaked him to see if that will help him poop? Also, you should try better greens. Kale is okay on occasion, but he would do better with staples like collards, turnip, mustard, or dandelion greens, as well as some squash. How does he get water? If he is a little dehydrated it will make it harder for him to go as well.