Jimmy Fallon is heartbroken … revealing his beloved family dog has passed away.

On IG Monday, the talk show host posted sweet snaps of their pup Gary — writing a heartfelt tribute about how the silence at home feels deafening without her … but that it’s slowly being filled with stories, laughter, and a few sniffles.

Jimmy even shared a few of those memories — calling the unforgettable pup their “first baby, a therapist, a pillow, a big sister, a schoolmarm, a comedian, a party girl and a rebel” all rolled into one.

Jimmy first introduced Gary to his IG followers way back in 2012 — so it’s clear she’s been a huge part of the family’s life for over a decade.