@Josephine_Spiro@hexbear.net has blessed us with all of the puppygirl and catgirl emojis in one place, so here they are! There's so many good ones here, so what I've listed are only a few.
Everybody loves cats, right? Some samples:
:catgirl-07: (keywords: catgirl, salute, 07, comrade)
:catgirl-mfwliberal: or :catgirl-disgust: or :catgirl-wtf:(keywords: catgirl, disgust, liberal, ew, nasty, wtf)
:catgirl-happy: (keywords: catgirl, happy, content, smile)
:catgirl-nospoons: or :catgirl-exhaustion: (keywords: catgirl, spoons, exhausted, sleep, tired)
:catgirl-smug: (keywords: catgirl, smug, heh, smirk)
:catgirl-laugh: or :catgirl-joy: (keywords: catgirl, joy, laugh, glee, smile, happy)
:catgirl-love: or :catgirl-pleased: (keywords: catgirl, love, heart, happy, pleased, wonderful)
:catgirl-cry: or :catgirl-sad: (keywords: catgirl, cry, sad, crying, tears, devastated)
:catgirl-peace: (keywords: catgirl, peace, calm, love)
:catgirl-huh: or :catgirl-what: (keywords: catgirl, confused, disassociate, what, huh)
:catgirl-sorry: or :catgirl-apologies: (keywords: catgirl, sorry, apologies, wink)
:catgirl-angry: (keywords: catgirl, angry, hiss, mad, scared)
It seems like there's no rule against it, just a recommendation that I misunderstood as a hard and fast rule.