Dry food suggestions for a heart condition

[Watters]

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