Only the best for my dog!
Add bones in your slow cooker then pour in water to cover them and a little more. Set for 8 hours. Pour into a large container and let sit for 2 hours. Remove the skim and foam on the top.
Pour into canning jars and cover. Refrigerate overnight. Open the lid and remove the top hard layer. Start giving some to your dog. I like to warm up a little bit them pour on his kibbles at breakfast.