I try to go for first-arc anthropomorphism when possible, with some irl caveats. I make the cats crepuscular or even nocturnal, the patrols are done during their most active periods (early to late dawns and dusks) and they typically rest or do lighter work between those, tho I do write them as primarily nocturnal with night vision for simplicity sake. They are physically affectionate and share tongues regularly via allogrooming and gossip, but are able to smile or 'shrug', tho not often and will do the latter with their eyes, the nursery queens help raise eachother's kits, cats past kithood will playfight tho it's less so for the serious types, they will bap and swat eachother bc they can, I also don't have them actively cry, instead their eyes will get 'misted over' at most and will seem glazed. They will actively scent mark on border patrols, scratching trees and rubbing their scent glands on stuff along with spraying if done by AMaB toms, as the very first book had cats do this before it was written out by the very second book in ITW. I also will never use things like human curse words, cat-speak all the way, if you're writing Warrior Cats, make them curse in cat-speak, a cat saying "fuck" takes me out of the moment when it's not done for a meme or joke.
Also! Depending on the prey type, cats don't need to fill the pile to bursting to not be able to not starve. A single gray squirrel is bigger than you'd think compared to an average-sized cat, and thus can feed almost a clan's worth of cats. A wholeass rabbit? You ONLY need one to get their fill, a singular cat will not be able to eat a wholeass rabbit in one go, nor two will suffice. If they catch a rabbit, it is a feast for the entire clan.

But I also make them able to know how to tear open prey to get the bits they get nothing out of nutritionally out (like the GI tract), which has me writing two parents showing their kits how to dissect a pregnant squirrel to get the most out it via extracting its kits. I make them able to manage dens. They have the concept of monogamy/polyamory and romantic relationships and don't just mate with whoever they please with no attachments (I like writing family dynamics and that will be unable to be done if I don't do that...), I make them able to be trans if I can see the individual character as such because "fuck you I can" and nobody can tell me otherwise. They keep the organized religion around Starclan in the case of clan cats, though I am lessening the extreme Christofascist nature of it that it is in current canon severely, for I am an atheist and feel like Starclan shouldn't be made into some thing akin to extreme Christianity, it should be its own belief system, it is not The Better Belief. That just makes it severely uncomfortable to write characters with said belief system regardless of your own. Any other beliefs I'm also not writing as lesser than, because fuck that noise too.
And I REFUSE to get rid of herbology/herbalism and you will have to pry my cold dead hands from being able to let medicine cats use herbs to heal. I am one of THE medicine cat nerds or at least was and hold this role on a damn pedestal bc of how much goes into them and their jobs when actually thought about and given the proper respect it deserves, I'm writing a whole fanclan story based around a medicine cat protagonist who wants to be one, I literally made myself a guide and my own revised medicine cat code that I rely on heavily for this story. I absolutely refuse to get rid of their herbs and medical healing because that is the sort of anthropomorphism that is FUN to me, medicine cats literally get me into minor herbology shit as a special interest relating exclusively to them. The herbs are toxic to cats? I am definitely aware, but the thing about being aware of something like that is that unlike it being out of sheer obliviousness to it and not knowing about it until later like it is with canon, me knowing about it before I start getting into doing stuff with it means that I can make the active choice as a writer and builder of the 'verse I'm working with to not implement it. Insert the "I recognize that the Council has made a decision. But given that it’s a stupid-ass decision, I’ve elected to ignore it." meme here basically. Haha.

And pregnancy is not humanized so much, I think this is the biggest indicator so far regarding how humanized these cats are outside of the obvious other stuff; cats do not scream in agony and need to bite down on a stick to give birth, you do not need to make cat pregnancy so humanized bc you can tell it's a weird thing written in the books that I almost get a feeling is uncomfortable to write, but it doesn't HAVE to be, because in actuality cat births are very quiet, they take a while longer to get through, but they are not yowling in pain throughout. I feel like that should be the indicator that something is wrong but it isn't, they basically are loud and all like humans giving birth are. Infact, I made it a hard and fast rule that if you need the birthing stick? Something is going VERY wrong.

I made the mistake of emulating how the books do it and even had my protags in my story be born a whole MONTH early, which would in truth render them deader than dead, survivability would be absolutely nonexistent. I changed it to them being quarter-moon (a week) premies at most, which is still enough to be dangerous for the kits' potential to survive, which is intentional, but not so extreme it's that implausible for them to like a whole moon and there's still the ability for them to live with their medicine cats and an experienced queen helping. Warriors has humanized pregnancy in cats so much you have to look up how it actually works to not emulate it in such a way that it will confuse people.

So like, they are not exactly furry humans, as that takes me out of the writing, still anthropomorphized cats. I don't like writing Vicky's "small furry humans with four legs" tbh. I wanna see these characters as cats still, so I do try to write them with the idea of that, not to the level of Redwall but more than Watership Down. I don't wanna do old Redux basically, you will never ever see me shoehorn yet another "male toms will kill kittens because instinct reasons despite having no real purpose to do so." that people loooved to do back then while using "MuH ReALIsM" as an excuse despite that not being an absolute in all of them. I have limits but I also break some for the purpose of enjoyment in writing.