So sorry Jenna is having issues. I am not sure why your vet is against home cooking. If done under the direction of a vet nutritionist it can be wonderful for a pup. My Cookie was diagnosed with lymphangectasia in 2011 and I have been home cooking for her since. I credit her diet with keeping her alive and healthy!
Mention this vet nutritionist to your vet. He might find her website valuable!
www.petdiets.com