Officers found Walch's wife under attack by the dog when they were called last month to a home on Princeton Street, according to The Herald. Walch refused to call off the dog and officers had to shoot the animal to stop the attack, police said.
"Officers had to shoot the dog for the safety of the victim," Rock Hill police Capt. Mark Bollinger told The Herald.
The victim suffered bites to her chest, legs and hand, police said. She was taken to Piedmont Medical Center in Rock Hill for treatment.
Walch was released on $10,000 bond after his arrest, court records show.
The Cox Media Group National Content Desk contributed to this report.