The chicken carcass is a natural source of calcium and some consumers swear by this natural source. However, its use in freshfrozen foods is often not safe for two reasons.
Firstly, calcium from chicken carcasses is not always digestible, giving the impression that the dog is digesting his portion of calcium, but the reality is often that this calcium is not really absorbed. Because of this lack of calcium absorption, this can lead to so-called rubber legs. The amount of calcium absorbed can be determined by looking at the stool. If the stool is too hard (because of the calcium), you immediately know that not enough calcium has been absorbed.
In addition, there is a risk of fragmentation which can cause injury to the oesophagus and/or stomach, especially when removing raw food for the first time.
We therefore advise against the use of bones for puppies (for which correct calcium absorption is essential) and for other dogs for which correct calcium/phosphorus absorption is essential.