Hi Caro-
There is no AAFCO guidelines or requirements for “senior” food. Therefore, it is up to each brand to determine what they are going to call their senior food if they carry one. Some brands’ senior foods are a little lower in protein and fat. Making them a little higher in carbs. Some brands maintain the protein level while dropping the fat and calories. Most of them have added glucosamine and/or chondroitin.
So, you see, it would probably be best to pick a four or five star kibble and add some high quality canned or fresh protein to it to make it more digestible for your dog.
I have fed the Nutrisource Senior food to my dogs. They are only three years old, but I liked the ingredients and analysis of the food. My dogs seem to be better with a little lower fat kibble as I add canned to many meals and it tends to be a little higher in fat.
Another thing to keep an eye on is fiber. Some senior and healthy weight dog food tends to have high fiber which could be good or bad depending on your pup.
Hope this helps. Good luck!
