r/cats
r/chonkers
r/blurrypicturesofcats
r/murdermittens
r/catsstandingup
r/tuckedinkitties
r/thisismylifemeow
r/meow_irl
r/cat
r/catswhoyell
r/blep
r/curledfeetsies
r/CatsAreAssholes
r/kittens
r/CatTaps
r/CatsInSinks
r/CatsStandingUp
r/catpictures
r/blackcats
r/WhatsWrongWithYourCat
r/Awww
r/Catswithjobs
r/StartledCats
r/CatGifs
r/StuffOnCats
r/catbellies
r/TheCatTrapIsWorking
r/catsareliquid
r/IllegallySmolCats
r/thecatdimension
r/seniorkitties
r/floof
r/sadcats
r/catsvstechnology
r/Siamesecats
r/Catmemes
r/battlecats
r/catssittingdown
r/mainecoons
r/torties
r/CatWiggle
r/EvilCats
r/CatSelfies
r/catsbeingjerks
r/purrkour
r/CatsBeingDerps
r/airplaneears
r/pinknosedcats
r/Hovercat
r/catsbeingbros
r/catsarefuckingstupid
r/BadassCats
r/holdmynip
r/CatLoaf
r/catsinpants
r/purrito
r/InbreadCats
r/StuffOnCats
r/TIGHTPUSSY
r/catlogic
r/InterruptingCats
r/holdmycatnip
r/CatsSmellingThings
r/Catspotting
r/teefies
r/barncat
r/LazyCats
r/Catbun
r/catplops

enjoy. let me know if i missed any