[Help] Looking for dog food recommendations

Looking to keep my dog young

I have a 9 year old Labrador retriever, whom I take swimming for about an hour roughly every other day

I stopped taking her running due to stiff joints, and swimming definitely helps but she is starting to get stiff at night and during the day

I’m looking for the best dog foods for older dogs that allow them to have a nutritious diet and live a healthy life into their elder years

Cost isn’t THAT much of an issue but I can’t afford a raw food diet

Any help is appreciated