I use Care Credit and it is the best, If not for them I do not know where Bella would be right now.
As far as food, I too use Natural Balance. Started with my 9yo bully due to allergies. She was on the Sweet potato and Venison. With Bella I had to switch to the Sweet Potato and Bison, it is lower in fat and that is what she needs in order to keep her exocrine pancreatic insufficiency in check. I also add some Omega 3 oil for their coat and it has made a huge difference on all our dogs. (have a Belgian Malanois also) Bella gets Krill oil (again, better for her) the others are on Salmon. Sometimes it is just patience with trial and error to find the right combo for your bully.
I am so glad you were able to get help.