My cat is acting kinda slow for a day now. Eating, drinking normal. Urine normal pale yellow. Third eyelid NOT raised. Walks with tail up. No sneezing or watery eyes. Pressed him everywhere no pain. Plays a little. Left him and 9 siblings in enclosed patio for a day and overnight with food and water while I cleaned my house. Acting slow after that. Siblings all normal though. Kinda sits and stares for a few seconds at stuff. He's usually kinda hyper, running and jumping which is why I'm worried
Hello and welcome to PetCoach.
Acting slow or 'off' is a sign of an animal not feeling well in general. This can happen due to many different causes including fevers, pain, stress, dehydration, and many other causes.
If he is just a little bit off and still eating, you can try waiting a day or two, because if this is just a small virus it will pass.
If he stops eating, is vomiting, seems sore, or isn't improving, or becoming more dull, then I would get him to a vet right away. Also, if there is ANY possibility he got into any rat-bait I would get him seen immediately.
Best of luck with Half And Half, I hope he feels better soon!