20 Brilliant Ways to Repurpose Old, Spoiled Milk

17. Make treats for your pets

While making a batch of milk donuts or waffles, you might as well use some sour milk to bake up a tasty treat for your pets. The pathogens will burn up in the oven, leaving nothing but a palatable tanginess that your furry friends will enjoy. Just make sure your dogs or cats aren’t lactose intolerant before feeding them a batch of homemade pet cookies.