Many people feed their pets raw bones thinking that they are providing their pets with calcium. The reality is, although bones provide calcium, they also provide phosphorus. In fact, approximately 85% of the phosphorus in the body can be found in bones (and teeth) — that's a mind blowing amount! As previously discussed in Part 1 of my book, our pets need almost twice as much calcium as phosphorus (not everyone agrees with this ratio and there will never be full agreement but nonetheless, that's the ratio I personally follow).
Raw meat is naturally high in phosphorus and low in calcium. Bones are high in calcium and also high in phosphorus. Thus when you provide bones as the source of calcium, you are also adding more phosphorus to the diet that not only creates, but adds to a phosphorus ratio imbalance.
One of the major keys to health for our four legged furry friends is to have a calcium to phosphorus ratio that's in balance. If this ratio is not in balance, health problems are sure to follow. On the other paw, when this ratio gets back in balance, health problems can begin to disappear. The calcium to phosphorus is the single most important ratio within the body. The calcium to phosphorus ratio builds either the foundation of good health or ill health, all depending whether it is in balance or out of balance.
The reality is that in nature, our pets would naturally get their calcium from the blood of their prey. Blood is rich in calcium since the blood carries the calcium to the cells of the body. Unfortunately, the meat we feed today is drained of blood. As a result, our pets are missing their natural source of calcium.
Personally, I use ground egg shells as the source of calcium. Ground egg shells are high in calcium and low in phosphorus. This allows us to easily add calcium to the diet of our pets. But let's take a look at bones a little more.
In nature, carnivores don't always eat the bones of their prey. A lion, as an example, after killing a zebra will eat the meat and leave the bones. Conversely, if a lion catches a baby gazelle, then the lion will eat the bones and meat. It all depends on the size of the prey. Ultimately, our carnivore friends are more interested in meat than they are of the bones.
This is why, after lions have finished eating a zebra you see the skeletal structure with just a little bit of meat left on it. The vultures then come along and pick off the last remaining meat. Then come the hyenas that actually eat the bones. Hyenas have exceptionally strong jaws and neck muscles and they live to eat bones. In fact, you can always tell when you are looking at the stools of hyenas because they are pure white — they are pure white due to all of the bones they have eaten. In fact, the stools of hyenas are also very dry allowing them to be used like chalk on a blackboard.
Now the arctic wolves will sometimes catch a musk oxen. When they do, they eat the meat and leave the bones similar to the lions. If you ever go to Ellesmere Island, the most northern island in the world where both the arctic wolf and musk oxen live, then you will see the bones of musk oxen littered across the island due to natural death and the wolves eating them but not their bones.
Lions like their meat — they focus on the meat. In fact, a lion can eat so much meat after catching a zebra that the lion literally cannot move. Their stomachs are so big and plump that they can't even get up even if they wanted to. Yet, for all of the food they have eaten, the bones remain.
With cats, as an example, they will eat the bones of the mouse they were to catch because it's a relatively small prey. On the other hand, if a cat were to catch a rabbit, the cat would eat the meat and leave the bones.
Whether or not carnivores eat the bones, in my observations, all depends on the size of the prey in comparison to the size of the carnivore.
Bones, therefore, in my opinion are not a crucial part of our pet's diet. In some situations our pets would naturally eat bones, in others they would not. Either way, blood, not bones are the natural source of calcium for our pets.
We use ground egg shells as a substitute for the missing blood. It's not ideal, it's not perfect, but it gets the job done.