The biopsies came back. No lymphoma cells. Hooray hooray!
Medical details for those who are interested.
It's definitely inflammatory bowel disease, which is causing a malabsorption syndrome, meaning Buster's system has not been absorbing nutrients properly. Even though he's eating, he's malnourished. His Vitamin B levels and pancreatic function are extremely low. Normal B12 levels for a dog are 600-700. Buster's are 150. Normal pancreatic enzyme levels: 20-30. Buster: 5.
In addition to a full course of Prednisone for the inflamed intestines, we'll be giving him Vitamin B12 injections. That is, I'll be giving Buster injections while Allan holds his head. Only one of us is brave about those kinds of things. The vet is going to teach me how to do this, but Dogsled_Stacie, if you have any tips or tricks, I'd be happy to know them.
The doc is hoping that if the intestines get healthier, the pancreas will come along for the ride. We'll have his pancreatic functions checked in a month, and if they've improved, we'll continue the same course. If they haven't, we'll start giving him pancreatic enzymes, too. I don't know what the pancreas does, but it seems one cannot live without it.
The doc is also researching veterinary internists in the T.O. area.
Here's the best news of the day. Of the week. Of the year. With the proper treatment, Buster can live a normal life span.
I'm all teary-eyed again, but this time with relief.