'This boy wasn't going to let anyone mess with his sister,' said the Kingsville Kleberg Health Department Animal Control & Care Center
Upon arrival, officers found a Catahoula mix protecting the lifeless body of another dog.RELATED: Hero Pit Bull Protects Young Lost Owner Until the Child Is Found by Police: 'Give That Dog a Bone'
"This boy wasn't going to let anyone mess with his sister. Our ACOs had a hard time convincing him everything was going to be alright and they were there to help him," a staffer at the animal center wrote on Facebook, adding that the call "was one of the most heart wrenching for our staff.
It is unclear how Guardian's sister died. The Kingsville Kleberg Health Department Animal Control & Care Center did not immediately respond to PEOPLE's request for comment.
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