apparently theres a theory going around that Smilodon (Sabertooth Tiger) has huge jowly lips to keep it sabers safe (they were quite fragile) and damn if it isnt eh best thing ever
Art Sources
https://unlobogris.deviantart.com/art/Where-are-the-fangs-here-there-are-611345739
https://dontknowwhattodraw94.deviantart.com/art/You-gained-lips-610989614
and not related to anything in particular but heres another sabertoothed animal and hes really pretty. Critter is gorgonopsid a stem mammal from the permian ( i think)
Art Source
https://www.weasyl.com/~ashryn/submissions/860170/gorgonopsid