My Sissy has early stage Protein Losing Enteropathy. We consulted with Susan Davis, pet nutritioniist, and Sissy has been on The Honest Kitchen freeze-dried raw - Embark in the morning, Preference with cooked White Fish and Salmon for dinner. She only gets about 1 oz of the fish mixture with the Preference. She is also on a probiotic, we use coconut oil with her dinner meal and she gets colostrum in the evenings. She has been doing very well and recent bloodwork is almost completely normal.
Here is Susan's information if you are interest....
Pet Health Pet Nutritionist Holistic Pet