Tridentine Tabby?
What are the tell-tale signs? (or would that be tell-tail?)

H/T to Iacobus

Aside from the Tabernacle front and center... aside from the altar rail... aside from the architecture that's unmistakably Catholic, here's the one, unmistakable sign that this is a Latin Mass feline --

This cat has to good manners to execute a good Catholic genuflection vice that lazy Novus Ordo bow, or head bob, or wave, or whatever the hell they do before they enter the pew.