"If I had a dog who was brain dead and I wanted to take care of my dog, I cannot imagine any judge coming in and forcing me to kill it."
He wouldn't have to. The animal would start to smell pretty bad in short order. What would you be doing as it defecates and urinates 2 or 3 times a day? How long before you would take it to the pound to be euthanized. But you'll come up with some cock and bull response, I'm sure.
Animals are not humans, you say. Yet you also said that animals are treated better than humans. If an animal was in the same state as Terri was, it would be euthanized at the pound. That's a fact. There is no better treatment; it would be worse, and the animal would be put away immediately.
Sorry, you are all over the place...better luck next time.