Arwen, thanks for the links and advice. It turns out that Hugh has pancreatitis. I heard it's caused by a high-fat diet. Oddly, I haven't been feeding Hugh a high-fat diet
All my dogs eat oats+apples+sweet potatoes (sometimes I add a little bit of canned food)... the vet said it could be idiopathic...
Anyway, Hugh is back home. He is looking much better. It's nice to have more than one dog because it can be funny to watch them interact. Hugh likes to lick Halle. Halle gets so mad at him, but never bites (just growls... she's always been gentle). Also, I don't want my dogs to be lonely when I'm out. I know that animals do get depressed.
My silky terrier is eating the same diet and she has perked up. Her coat looks shinier. I will try to feed the same stuff to Hugh. It will be tough. Hugh is extremely stubborn. I have to syringe in some vegetable juice and I know he will growl and snap at me. You know Chihuahuas... they always think they're the boss...
To be honest, I *have* set up a crowdfunding campaign. It only covers the cost of Halle's CT scan. I haven't posted it here, because I posted it on another site and got banned (forever)... I have taken a lot of flak while begging people for money... I've never sought financial help until after Halle's diagnosis... There are people telling me, "If you can't afford to have a pet, you shouldn't have one." But, I didn't expect my pet to get cancer.
And then there are those who think I am being cruel for allowing Halle to live instead of putting her out of her misery. I know dogs are tough and try not to show pain. It's survival instincts. But, still, there are always subtle signs (which I am observing closely for). Halle is still a happy, lively dog. Here is a video of her I took outside the animal hospital, before she went for biopsy: https://youtu.be/mAeK_zwr1bA
She also eats like a champ. I'm not putting her down... I'm not giving up on her.