My cocker was having bowel issues at the end... I'm not sure if it was mental or physical though, she was losing her mind.... she'd wander and pace, very aimless and confused, and the thing that hurt was that she no longer found much comfort in me. She found comfort in Logan though.
One thing I'd recommend if she's no longer eating enough is Red Cell. It's a liquid, looks like blood, that you can pour on the food. It enabled mine to hold weight a good long while after she started to become kindof frail.
My boy is starting to become a little confused too. Not excessively so, but sometimes it seems like he forgets where he is. He still recognizes people though, and is more or less himself. It's just little clues now and again right now. I'll keep Red Cell in mind. Thanks for the tip. :-)