@ Joann H
A echocardiogram is not always necessary to detest signs of DCM (dilated cardiomyopathy) I think your vet would have suggested it if he thought it or additional testing was warranted.
Regarding dog food, ask your vet about this one. The ingredients that you are concerned about are not in the first 10.
https://www.gofromm.com/fromm-four-star-nutritionals-salmon-a-la-veg-food-for-dogs
I have a sensitive dog that does well on this formula.
Yes, I would trust your vet, he is the veterinary healthcare professional that has examined your dog.
