Hi EHubbman –
Yes the calcium to phosphorus ratio is very important for all dogs and should be no less than 1:1 and no more than 2:1, with around 1.2:1 being considered ideal. However when it comes to large and giant breed puppies, the overall amount of calcium consumed is still very important. Even if a food had an appropriate ratio but the calcium levels were very high – say 2.2% calcium and 2% phosphorus (1.1:1) – I wouldn’t feel comfortable feeding the food to a large or giant breed puppy. All three of my dogs eat a raw diet and my most recent pup (now 11 months old) was weaned onto raw at 8 weeks old. To keep the calcium levels controlled while still keeping the calcium to phosphorus ratio balanced, fed her green tripe for around 25% of her diet. Green tripe has a naturally balanced calcium to phosphorus ratio (roughly 1:1) but has very low levels of each mineral (only about 0.3%).
