Teach Old Dogs New Tricks! Tender, crumbly, bite-sized morsels of our best selling Lucky Slims. Each treat is made with restaurant quality chicken and locally sourced produce inside an edible beef collagen casing, just like a sausage. These small treats are great for grabbing by the handful and keeping in your pocket for long walks, or as a regular reward for training.,Teach Old Dogs New Tricks! Tender, crumbly, bite-sized morsels of our best selling Lucky Slims.