Meats are high in phosphorus bones are high in calcium. When meat is fed with 10% bone you have the exact ratios of calcium to phosphorus required by a dog. Organ meat should not exceed 10% of the diet overall and 5% of that should be liver (beef liver has the highest nutrient levels). Feed liver once a week or several small servings per week. Ensure you do not over due the amount of liver you feed. Dogs can get a condition called hypervitaminosis A or an overdose of vitamin A if fed excessive amounts of liver. Symptoms of a vitamin A overdose can include bone deformity, bone spurs on the dogs legs or spine that cause him to limp, digestive upsets, muscle weakness, stiffness or weight loss. If you suspect your dog may have a vitamin A overdose
