My toy poodle had an "infection of the stomach lining" when she was three. The symptoms were:
Vomiting (sometimes with little flecks of blood)
Now, she's ten and just had similar symptoms. Our vet didn't do much for her except tell me to "put her down." I didn't take their advice last time. This time, knowing what their "advice" would be, I decided to search what those symptoms would be called in a human. Peptic Ulcer was the result. For humans, the recommended dosage was 45 drops of each for the Cat's Claw extract and Bilberry extract as well as 2-3 Slippery Elm pills.
I did 1/3 of the dose for a human and it works like a charm. :) Advice I have for those of us who are pet guardians: Make a list of the symptoms, get an animal communicator (www.communicationswithlove.com was who I used) to talk to your animal, then search for a cure for humans rather than dogs.