Is it possible that the cat found and ate some rat poison all by itself?
No. I don't think the cat ate rat poison. Cats are very picky.
Dogs might do it. Not cats. Dogs are omnivorous. They eat almost everything.
I wouldn't trust most of this AI gossip online.
Blood clotting can be due to several things.
Feline Arterial Thromboembolism (FATE) = saddle thrombus is correlating with Cardiomyopathy, and various other heart disorders.
So giving vaccinations is a good idea to prevent this with a healthy diet.
Mostly its not needed if the cat is indoor in NYC?
Depending on where she lives? garden or apartment only?
If its eating rodents, then it might be a good idea, indoor, or not.
Could be due to many other things as well.
I would be surprised if Styx was killing cats. He better look over his shoulder then.
I wont tolerate such honestly. That would be downright psychopathic and its hard to envision him getting off on this?
Unless his that nuts that his doing some sacred blood ritual. I find it unlikely though.