Johnson is accused of beating a 6-month-old shepherd mix with his fist and a 12-pound rock on Nov. 3. The injured dog was taken by its owner to a veterinarian, where it was euthanized.
Investigators say Johnson told them he acted in self-defense and that the dog wounded his wrist and thumb.
Los Angeles County Fire Chief P. Michael Freeman said last month that Johnson has been placed on paid administrative leave.
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