Hi Kelsey,
In addition to the blood testing was urine tested? If not that might help in determining the best course for your dog.
Ask your vet about g/d diet. The phos level is lower than commercial foods but protein is higher than K/D. I believe it is for just this type of situation. To determine if a non vet food meets your needs verify with the company what the max phos is. Non therapeutic diets are not specifically formulated for medical problems and the company may not be monitoring the the phos level in the diet as closely as the vet may want. Hill’s, because they are kidney centric likely does monitor phos in their senior products
