Demi Lovato Dog Mauled to Death by Coyote

7/29/2015 10:50 AM PDT BY TMZ STAFF

0729-demi-lovato-dog-cancelled-INSTAGRAM-01Demi Lovato's dog Buddy was ripped apart by a coyote ... and she's the one who made the gruesome discovery. 

TMZ has learned Demi's dog was torn to shreds Sunday ...  after a coyote wandered onto the backyard of her LA home. 

Demi was devastated saying, "We are absolutely heartbroken to be writing this but Wilmer and I are devastated to inform you that we lost our little angel Buddy last Sunday. He was taken from us way too soon in a tragic accident."

The pop singer was so stricken with grief she cancelled her "Good Morning America" appearance scheduled for Thursday. 

RIP Buddy.