GH: Why Did Officer Shoot I-90 Pug?

My husband and daughter pulled over to assist the little dog and in the hope of returning him safely to the owner. The dog was coming toward her when the officer on the motorcycle scared the little dog off again. At this point my daughter went back to her truck to get treats to entice the dog back over to her. The little dog went over to the officer’s car and laid down by the passenger door. The officer moved his car away from the dog then got out of his car and shot the little dog. He then went over to the dog, picked him up, and threw him in the ditch like a piece of garbage/ Geri Henricksen , Juneau, Alaska. More here .

DFO: I recall hearing something about a pug running loose in the median of I-90 Friday afternoon. And I thought I heard later that the dog had been injured and an officer shot it. But I can’t be sure. Sometimes, you can snippets of transmissions. I didn’t post anything on scanner traffic because I wasn’t sure of the details.

Question: When should an officer shoot a loose dog?