Beware of all pre made meats that are made with only chicken necks, backs and frames. This kind of pre made meat will cause an overabundance of calcium in your cat or dogs system leading to kidney and bladder stones! The most ideal Ca:P ratio in the cat's diet is 1.1:1. However, cats can easily tolerate up to 2:1. Any more Calcium in the diet would cause an over saturation in the body, and can result in Calcium deposits in soft tissue such as Oxalate stones. You need to have more muscle meat then bones to have a properly balanced bone to meat ratio in your cat or dogs diet. Ask your pre made meat supplier if they use breast and thigh meat in their product before you purchase it. Most of the pre made meats out there do NOT use enough muscle meats in the tubes of meats they sell. You want them to use the whole chicken or rabbit.
It has been our experience, along with some other cat families, that certain frozen raw pet patties have larger then normal and sharper bones it their products. This is from not grinding two to three times. Cats will throw up this bones or the bones can get lodged in their intestinal tract. One feline caregiver told me her cat was X-rayed when he stopped eating and they found undigested bones packed in his intestinal track.
Cats eat the bones from prey that break like spaghetti and are soft to chew. Cats teeth are not as strong as a dogs or exotic cats. Please, if you want to grind your own rabbits and chicken, make sure the whole carcass is in whole, not backs and necks, and please grind three times.