Xīnwén bàodào le yī qǐ nüèshā liúlàng gǒu de ànjiàn.
The news reported a case of someone sadistically killing a stray dog.
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虐杀 is a strong, mostly written/news word implying the killing involved torment or cruelty — much heavier than plain 杀 (shā, to kill). Often appears in legal, journalistic, or animal-welfare contexts.
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The 虐 character literally pictures a tiger's claw (虍) over a person — built into the word is the image of a predator tormenting prey, which is exactly what 虐杀 implies on top of regular killing.
