Wildlife Victoria has posted a Aus$10,000 ( US$7,600, £5,000) reward to find the person responsible.
Wildlife Victoria spokeswoman Fiona Corke, said the kangaroo was rescued just days after another kangaroo was found with an arrow in its rump in the same area.
"It's just unbelievable, I can't believe that anyone would do something so cruel," she said.
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