Such a tragedy that Morris would be so horrifically treated by whoever shot and abused him, but such a blessing that you took him in and are giving him all the love that he so desperately deserves.
I wonder if the "masses" in his mouth and ear might not just be more buckshot rather than tumors. If so, perhaps he could have years of good health still ahead. Have you considered contacting local rescue organizations or shelters and seeing if you can get one of them to cover the cost of his medical care? At least biopsies of his mouth and ear to find out what he's really dealing with? It seems such a shame not to know if he can actually be medically helped, but I certainly understand your inability to pay for the diagnostics yourself.
There are also a number of other organizations that may be able and willing to pay for his medical care. Here's a list of possibilities:
In Memory of Magic (IMOM) is dedicated to insuring that no companion animal has to be euthanized simply because their caretaker is financially challenged.
IMOM, Inc PO Box 282 Cheltenham, MD 20623 Phone (866)-230-2164 Fax (301)-599-1852
Help-A-Pet is a nonprofit organization which provides financial assistance for the medical care of pets whose guardians are unable to afford the expense
Help-A-Pet P. O. Box 244 Hinsdale, Illinois 60521 Telephone: (630) 986-9504 fax: (630) 986-9141
United Animal Nations LifeLine Grants - Help animals in need of assistance after their caregiver has suffered a personal tragedy such as a house fire, domestic violence situation, or natural disaster.
RedRover : Programs : RedRover Relief
United Animal Nations P.O. Box 188890 Sacramento, California 95818 Telephone: (916) 429 2457 fax: (916) 429 2456
American Animal Hospital Association (AAHA) helps those in need access quality veterinary care for their sick or injured pets.
AAHA Helping Pets Fund
Angels 4 Animals helps pet owners with financial constraints not lose their sick or injured friends.
Care Credit - A credit card company for health care, including veterinary care. Gives convenient payment options so you can get the procedure you want for your pet.
CareCredit Healthcare Finance - Payment Plans and Financing for Cosmetic Surgery, Dental, Vision, Hearing, Veterinary & Other Medical Procedures
The Pet Fund provides financial assistance to owners of domestic animals who need urgent veterinary care.
The Pet Fund | Veterinary Care Funding
Pets Add Life