The Yavapai County Sheriff's Office says the fox, which later attacked an animal control officer, tested positive for rabies.
The unidentified Chino Valley resident told deputies she was on a trail Monday at the base of Granite Mountain when the fox attacked, biting her foot. The woman said she grabbed it by the neck when it went for her leg and it latched onto her arm.
Thinking the fox was rabid, she wanted to make sure it didn't get away so she ran to her car, where she was able to pry open its jaws, wrap it in a sweat shirt and toss it into the trunk.
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The woman is receiving rabies vaccinations, as is the animal control officer.