My cat is showing unusual signs

Question
Hello! I have a 3-year old male healthy outdoor cat and has no history of vet checkups but just this morning I heard him making loud noise outside our house as if he's crying and noticed that his hind legs are very weak. When I let him in the house he suddenly deficated with fresh blood stained feces. What's very strange was he walked backwards while making those crying sounds. Thinking that my cat was hit by a car and may have internal hemorrhage I immediately rushed him to a nearby vet. The vet told us that vital signs are normal, and hind leg muscles bruised. the vet also assured us that bloody stain stools were not a sign of an internal hemorrhage but probably of a parasite infestation. The vet only gave our cat a shot of electrolyte and prescribed us electrolyte sachets for him.

Minutes after we arrived home I noticed that our cat also has unusual muscle spasms when sleeping.
I am very eager to hear your opinion Ma'am Connell. To sum up everything, our cat suddenly experienced the following signs: a. Weak hind legs, b. makes crying sounds, c. Bloody stained stool, d. Walks backwards , e. unusual muscle spasms while sleeping.

Please forgive my english Ma'am Connell for I am a Filipino.
Thanks in advance and God bless!
Yours truly,
Muhammad

Answer
Your vet is probably correct in saying that the blood is not from being hit but from either parasites or from what he eats.

It's quite possible, and more likely, since this cat must not be neutered either, that he has been in quite a fight and has been bit and beat up, hence the weakness and crying.

He is probably in pain from that and that's why his muscles are spasming.
I hope, for your safety, that this cat is at least vaccinated for rabies every year!!

I would keep giving him the electrolytes, and when he is feeling better get him neutered and wormed, and vaccinated for everything!

Keep him in the house and watch his stools for anymore blood. Get him on a higher quality diet as well, and the bloody stool will stop, once he has been wormed.

So get him over this episode, then get him in to be neutered, wormed and vaccinated, especially for rabies.