Based on the history you provided, below are possible causes for your kitten’s weakness. If you still seek further information, please visit our Ask The Vet page to submit a one on one consultation with a licensed veterinarian 24 hours a day, 7 days a week.
Intervertebral disc injury
Medially luxating patella
Early stage panleukopenia
I have a “rescue kitty” that found us about 6 months ago. He’s approx 8 months old, normally very active and playful. The past two days he’s been extremely lethargic, barely moving. He has eaten and drank water and used the litter box but less than normal. He just lays around, not reacting to sounds and stimuli. His gums seem pale, and his third eyelid is more visible than it normally is. He is not grooming himself at all. He is fixed and up to date on his shots thanks to a local low cost program.
Unfortunately I am not in the financial position to bring him to a vet (we never planned on bringing a pet into our family- but he found us and we fell in love), so hoping for some advice.