Ozzy Osbourne is mourning the loss of a beloved member of his pack, announcing the death of his longtime pet, Rocky.

The rock legend told his fans about the tragic news today … his Pomeranian of 15 years passed away earlier this week.

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He wrote … “Two days ago I lost my good friend Rocky who has been at my side for 15 years. I’ll see you on the other side my friend. I love you always.”

While Rocky was one of many pets owned by the Osbourne family, Rocky was without a doubt a favorite … regularly appearing on Ozzy’s social media accounts.

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For instance, back in 2017, Ozzy uploaded a video of Rocky rocking out to his music … declaring the pooch his “number one fan.”

Jack Osbourne even roasted his dad on Instagram a couple years back for Facetiming with his dog … saying he “gets more excited” about pet updates than anything else.

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Ozzy isn’t the only one feeling Rocky’s loss — Black Sabbath’s official Facebook page shared a photo of Ozzy and Rocky in honor of the late dog … while countless fans expressed their condolences to the rocker and his family.

It’s the latest tough development for Ozzy in recent months … he’s had to take a step back from touring due to his battle with Parkinson’s disease amid other ongoing health issues.