Good for you! Going to a specialist or vet school for these very sick pups is essential imho in arriving at a diagnosis and treatment.
I am particularly impressed with that trip you took!!! I travel 45 minutes each way to the specialist and 2.5 hours each way to the vet school and think that is long. You are GOOD!
I am glad you went and have shared this with all of us.
Hope that Toby improves. Did they consider MVD?