Dwayne "The Rock" Johnson posted a touching tribute to his pup who died after eating a toxic mushroom.

The 43-year-old actor/wrestler rehashed the tragic details of Brutus' unfortunate plight on his Instagram page.

"At approximately 11:15pm last night myself and @laurenhashianofficial had to make the painful decision to end Brutus' suffering by taking him off of life support and sending his soul to pup heaven. I held his lil' paw as he was finally at peace," Johnson wrote.

"As all puppies and dogs do, he ate a mushroom while playing outside with his brother Hobbs. This mushroom happened to have a lethal toxicity and within hours it was rapidly destroying his liver and immune system to the point of no return," he shared.

Fans may remember Brutus as the pup that Johnson saved from drowning in their pool.

Johnson was in the process of housetraining Brutus and his other pup, Hobbs, when the two dogs "take off in a full sprint and fall right into the deep end of our pool," Johnson recounts. Hobbs began to do the doggy paddle, but Brutus sank "like a brick" down to the bottom of the pool, head first. Johnson sprinted and jumped into the pool to rescue Brutus and brought him back to the edge of the pool.

Johnson found a humorous way to cap off that experience, anyway.

"He was a little delirious.. took a moment, threw up all the water he swallowed and looked up at me as if to say, 'Thank God you didn't have to give me mouth to mouth!' and then ran off to play with his brother."

Brutus survived that, but Johnson's phone did not. He apparently went in after his pets, fully clothed, cellphone in pocket.

That shows just how much this wrestling champ loves his dogs.

With that, he gave a word of advice to dog-lovers everywhere. "I encourage all of you out there to be mindful of mushrooms in your yards, parks or anywhere outside your dogs play. What looks innocent, can be deadly to your lil' family members."

The internet exploded with Brutus' regrettable story--proof that a dog really is, man's best friend.

"We'll always love you Brutus.. and you'll always be my lil' main man and rough housing Brute."

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