Hi Laura!
It’s great that you’re trying to rule out major physical diseases through diagnostic testing. If nothing is found, I urge you to find a holistic vet who is interested in nutrition. This is an area that just isn’t covered well in most conventional vet practices.
I work with dogs with similar problems often. I find that once I talk to their owners/guardians at length, there are usually a host of other minor symptoms that have been overlooked. I personally love using homeopathy and nutrition/supplements to help dogs in situations like this.
I only work with people who are local to Phoenix, AZ, but you can look for a vet near you (or one who does phone consultations) at http://theavh.org or http://www.ahvma.org/find-a-holistic-veterinarian/
There are many articles about dog nutrition and holistic health care on my blog: http://naturalalternativesvet.com/blog You might find some of them helpful in your situation.
Tabitha (Dr. Thompson)
