Store any leftover dog ice cream in an airtight container or keep in molds in the freezer. It's best to consume within a few weeks for optimal freshness. Allow it to soften for a few minutes before serving as it can be hard out of the freezer. For dogs sensitive to dairy, substitute Greek yogurt with a dairy-free alternative. You can also add pieces of dog-friendly fruits or mix in flaxseed or pumpkin puree for added benefits. Experiment with other dog-safe ingredients for different flavors.