Has anyone tried the Nature's Variety raw frozen bones? I saw them at the pet store today and I am really interested in trying them, especially since they are supposed to be really good for cleaning teeth. We are already feeding NV frozen raw medallions and my Jimi loves them, so I was considering trying these bone treats as well.
..I just think they look so huge, I am wondering if they are meant for larger dogs or multiple feedings. So if anyone feeds these to their furbabies, I am just curious about (1) how often you feed them and (2) if you have to take them away, clean them off, and put them back in the freezer for a later date since they are so big!
any comments would be greatly appreciated 
Here is the explanation on the NV website:
Raw Frozen Bones
Raw bones are an excellent source of minerals, essential fatty acids, proteins, and enzymes. They are also a natural, balanced source of calcium and phosphorus. Feed a raw bone as a natural source of chondroitin for joint health or a natural source of fiber. Raw bones can also promote teeth and gum health for better breath! If you're feeding a raw bone for the first time, we recommend starting with a Raw Beef Bone.
Nature's Variety Raw Frozen Bones are found in the freezer, and are available in:
Raw Ham Bone
Raw Lamb Bone
Raw Beef Bone
Raw Bison Bones
Turkey Necks
Split Beef Knuckles