Oh my, this poor boy has been through the mill.
May God bless you for helping him.
Since his gums are not pale, we can rule out an internal injury. You are probably correct that he got him by a car. He may also have fallen or been hurt by a human creep
He most likely injured a disc or verebra in his neck or spine. Cats are great healers so with cage rest he should improve.
Sprinkle a 16t of a tsp of turmeric (curcumin) on his food every day.That spice sold in health food stores is a natural anti-inflammatory.
I would put off his neuter until he improves or he may not survive the anesthetic.
If you need financial help wih him her are some agencies:
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."
Please stay in touch with me and let me know how the boy is doing. I will always be here for you.
I hope you win the lottery for what you have done for him!!
Sincerest best wishes,