Here's an update:

They are pretty sure what's causing the bleeding is a mass in the area of his stomach so he will be having exploritory surgery tomorrow. This is what she told us:

It could just be a non cancerous mass and will remove it.
If it is cancerous she will call me and tell me what his chances are.
If they find it's cancerous and it's spread she will call me (they would then just put him to sleep).

I feel like I've been on a rollercoaster ride all day long.
The good news is that he was feeling a little better tonight after some fluids (they had gave him almost a whole bag).
He even did his famous head twist when he heard our voice
We got to go in and be with him and even take him out for a walk (which he loved!). I hated to leave him but I know it's in his best interest to stay there. If we brought him home he would just get sick again from having no fluids. So tonight he stays there. And honestly, he didn't seem too upset. He got right in the kennel and layed down. And of course I took a couple of pictures but I didn't have the digital so I have none to share.

Please, please, please keep my boy in your thoughts and prayers that it's not cancer.

Thanks to all of you. He means the world to us and we can't imagine loosing him.
And thank you Robin for the lovely siggy. I will get it up as soon as I get done posting.