Wow! You are so great to do all of this.
The Pepcid seems like a great idea and if your dog's dose was 1/4 then I am confident giving the same. Is it once daily?
The black stool was only with the last episode. I never saw it before when she was suffering. The shaking after eating is kind of new. she used to shake and want to be held, but not immediately after eating. That's when I thought it may be reflux because of the digestive sounds that came with the shaking, it seemed like she may have digestive cramping. But along with it came the swallowing frequently and occasional vomiting.
I wonder, is there a such thing as a complete barium study that includes both upper and lower?
I will certainly keep you informed and I would love to know what food you use.