Until Scout's last few months, I mixed low phosphorous kibble (Royal Canin maxi weight care, or Merrick campfire trout feast, or something similar) with added low phosphorus foods such as bacon, 80% fat hamburger, dark chicken meat with skin, cream cheese, half-and-half, and sweet potatoes. I wasn't confident about getting balanced nutrition, so I added a dog multivitamin/mineral supplement and lots of omega 3 oil, which is supposed to be good for general kidney function.
I chose commercial kibbles with low phosphorus off of one of the links on the Canine Kidney info. website that GreyTzu posted. Figma, you wrote --
You're right -- it is complicated. That's why I love that website -- you can reach a ton of different articles and get much more in-depth and well-rounded info. than when you read just a few simple things that say, "Do this and do that."
I fed my first greys a Royal Canin kibble and liked it but its maxi weight care kibble is high in corn/grains. Joejoesmom, whose opinion I respect, posted that
The Merrick trout kibble has one of the lowest non-prescription phosphorus levels around. I think I remember that much of the phosphorus in bones comes from the marrow?? Do fish bones have marrow? [Hangs head in biology dunce shame.] White potatoes are relatively high in phosphorus for a vegetable, but sweet potatoes are much lower and also have great nutritional value.
I'm sure that the low phosphorus/high fat animal product add-ins to Scout's food were a big reason for his bout of acute pancreatitis in his last few months. But if they also helped him have almost 3 happy years after his glomerulonephritis diagnosis, maybe it was a worthwhile trade-off.
PS: There's some research that shows that Enalapril also helps kidney function in general in dogs, in addition to helping control blood pressure.