The 'San Andreas' star, who saved the French bulldog from drowning in his pool earlier this month, is devastated by his pet's death, reported TMZ.
The 43-year-old actor paid tribute to his late puppy on Twitter, writing: "We'll always love you Brutus ... And you'll always be my lil' main man and rough housing Brute (sic)."
The dog was initially placed on life support, but had no chance of survival as his liver had completely shut down as a result of ingesting the toxic mushroom.
"I held his lil' paw as he was finally at peace."
The sad news comes just weeks after Johnson, who only recently purchased Brutus and another bulldog named Hobbs, was forced to jump into his pool on September 7 when the black-and-white pup sank to the bottom.
