Hi neezerfan –
Once thawed raw food should be used within 3 days. I’m only aware of two pre-mixes designed to balance a bone inclusive diet – one is the whole carcass formula sold by Feline Instincts and the other is CarnivoreRAW without Calcium sold by Young Again Pet Food. A much cheaper route would be to just add a low calcium or calcium free human multi-vitamin, some veggies (or a fiber supplement) and omega 3’s. You could also learn to balance a recipe completely from scratch with whole foods (this is what I do) but it’s a bit more time intensive and takes a bit of research. Rabbit is high in bone (as are most smaller prey animals) but the calcium to phosphorus ratio is still balanced so it’s not necessary to add more meat. If you find that your dog is constipated you can certainly add more more (high levels of bone can cause constipation for some dogs) but I honestly don’t think it will be an issue. The rabbit heads should be fine for your dog, you’ll have to try them out and see though.
