Usually a large breed formula is only truly necessary for a growing large breed puppy. The calcium and phosphorus levels are usually balanced better in large breed puppy food, ensuring proper growth. Not sure about the guidelines for adults though, never had huge dogs
Studies have shown that senior dogs need more protein per kg of body weight than an average adult dog, up to 50% more. Senior dogs on low protein foods had weaker muscles and more muscle tearing. There is no beneficial reason to lower a healthy senior dog’s protein intake.
As a general rule of thumb, my vet tends to recommend around 2g of protein per kg of body weight for a healthy adult dog and 3g of protein per kg for a healthy senior
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