Dry food suggestions for a heart condition

Hello everyone, I’m after some help/advise please. My 6 year old female dobermann has recently been diagnosed with the early stage of DCM, which is a heart condition. I’ve already started her on supplements, taurine, L-carnitine etc and also give her beef heart 3 times a week. I am now looking at changing her food. She is currently on simpsons 80/20, but I’m trying to find an alternative dry food which is lower in sodium and fat but still with a high amount of protein. I’d be very grateful for any suggestions. Thank you, Sue