I honestly don't know what it is that my dog loves about these so much. He is a standard poodle - 65 pounds. These are a good size for a treat for him. I haven't actually measured, but I would guess about 1 X 2 inches. I'm not looking to give him a meal... just a treat. For training I will break them into several pieces. He is not a "chow hound" and does not get excited about food or most treats, but for some reason he absolutely loves these dry, boring looking cookie/bones. He will do anything for them. Go figure... A friend gave him a bag for Christmas and after he had the first one, he started spontaneously doing every trick in his repertoire. He was sitting, standing, laying down, spinning and offering hand shakes. Absolutely unprecedented behavior for a non-food motivated dog! I was happy to find these on amazon as they aren't in my local pet stores. Since they are dry "biscuit" style treats, they are also less yucky to keep in your pocket when you are out and about. I hope he doesn't get tired of them!