Deebo was taken to a veterinarian and is expected to survive. The officers were not injured.
"We would like everybody to give your thoughts and prayers to Deebo so that he has hopefully a good, safe recovery in the future from his injuries," Ruth told MLive.
Officers were able to rescue the hostage, a man.
Officers had been called to the area in the past. The nature of those calls was not released.
Deebo has been on the force three years, WSGW reported. He is one of the department's five K-9s.
"Deebo is there to protect the officers," Ruth told MLive. "Deebo ends up getting injured just like an officer. Any time somebody is injured gravely like that, with a knife put in your head, it's a pretty grave incident."