Honestly I think K-9 use on any suspect that has not exhibited LIFE THREATENING behavior is cruel and unusual punishment.
I have a close in law who was a Police Officer. He relates a story, he was at an overnight training session and K-9s were there as part of the training. He was just taking a break between training and one of the dogs got loose and silent as a shadow ran up on him and before he even knew it ripped his arm or shoulder..can’t remember which. It was bad enough he got a few days off with pay.
These dogs are not all human like intelligent and empathetic like the movies make you believe. Many are savage beasts just with a little training to redirect their blood lust.
Some of that sounds like training.
Around here they had a LEO handler and K-9 that used to attend public events. The dog nipped at people and they were not taunting the dog or going up to it. That was the end of the visits. The handler passed away several years ago and someone in LE later advised me that the handler was not working his dog enough and that this led to behavioural issues of the K-9.