It's a sad day for dog lovers everywhere. Fifteen years after he made his debut in Legally Blonde, Elle Woods' little Chihuahua pup has moved on to the great dog run in the sky.

Known as Moonie, or Bruiser to those who caught his cute mug on the big screen, the little canine star passed away Thursday at age 18. Reese Witherspoon (Elle) and Moonie's Legally Blond trainer Sue Chip took to Instagram to bid a fond farewell to their four-legged pal.