Was dog at center of Santaquin euthanasia controversy poisoned?

The search continues for the person who possibly poisoned a dog in Santaquin, as the Humane Society also fights to stop the city from euthanizing it. More on the story: https://www.deseretnews.com/article/900003640/was-dog-at-center-of-santaquin-euthanasia-controversy-poisoned.html