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WINMALEE, Australia (CNN) -- A man in Australia is under arrest after allegedly running over his sister with a car because he was mad at her cat.

The sister had to be given medical treatment after the incident.

Police say the siblings were arguing after the 19-year-old woman's cat urinated on her brother's computer.

Authorities say the 20-year-old man tossed the cat into his car before striking his sister with his vehicle outside of their home.

She's suffering from a fractured spine, leg and a collapsed lung.

The brother was charged with assault and negligent driving.