If you do a search, you can find a lot of recipes already posted here. Since dogs are MUCH easier to please than people, almost anything you mix together and bake for a while will thrill them - I use rice flour, oatmeal, an egg, some peanut butter, chicken broth, grated carrot, sometimes some grated cheese... if you're a baker at all, it's easy to wing it! And I have no patience for the fancy things, like cookie cutters - the dogs don't care, so I press the whole batter onto cookie sheets, and when they're done, I cut or break them into pieces. If you like crunchy, baking at about 300 or 325 for a bit longer will allow the batter to dry out more and be crisper - 350, they'll be more cookie-like.