I mean, I have my own Lupin and Aranea implementations if anyone wants to use them in my games so I'm not worried about that angle.There are options for Dogfolk and Spiderfolk. It just depends on whether your gonna restrict yourself to official WoTC or if you don't mind doing 3PP.
It's not like 5e races are all that hard to create rules for. Much less work than creating a subclass (or even a background really).