A lot of determining what is going on with our babies involves diagnostics particularly bloodwork. Your dogs symptoms are rather vague and it would be impossible with these symptoms for me to tell you what is going on. Possible ideas are pancreatitis, diabetes, kidney disease, liver disease, lymphoma, broken tooth, toxin, intestinal parasites, and the list is actually endless.
Foods that you can try to get him eating are boiled chicken, baked hamburger, scrambled eggs, bread, pasta, cottage cheese, yogurt, basically anything to get him eating again.
You can give him a pepcid to help settle his stomach. This can be given daily. The yogurt can help to improve the diarrhea. I would also add some boiled white rice as well. Flavor things with chicken broth to help tempt him more.
I would seriously start looking into financial assistance, humane society and the links I have included to see if you can get any assistances:
American Animal Hospital Association
" Through the AAHA Helping Pets Fund, veterinary care is possible for sick or injured pets even if they have been abandoned or if their owner is experiencing financial hardship."
Angels 4 Animals
"Our services range from financial aid to complete treatment
to those pets and pet owners in need."
A credit card company for health care, including veterinary care.
"With a comprehensive range of plan options, for
treatment or procedure fees from $1 to over $25,000, we offer a plan
and a low monthly payment to fit comfortably into almost every
Feline Veterinary Emergency Assistance (FVEAP)
"Seniors, People with disabilities, People who
have lost their job, Good Samaritans who rescue a cat or kitten - any of these folks may need financial assistance to save a beloved companion."
The Feline Veterinary Emergency Assistance Prog ram is a nonprofit 501
(c)(3) organization that provides financial assistance to cat and
kitten guardians who are unable to afford veterinary services to save
their companions when life-threatening illness or injury strikes.
God's Creatures Ministry
"This fund helps pay for veterinarian bills for those who need help."
"Our efforts focus on serving the elderly, the disabled, and the
"We are dedicated to insure that no
companion animal has to be euthanized simply because their caretaker
is financially challenged."
The Pet Fund
"The Pet Fund is a registered 501(c)3 nonprofit association that
provides financial assistance to owners of domestic animals who need
urgent veterinary care."