Unless I missed it, there is nothing in the link you provided that says anything about the breed of dog.
According to the article, the girl had previously interacted with the dog without any issues.
The article also says that the house is adjacent to the woods that have wildlife.
Sat. image of 30200 block of 92nd Avenue East in Graham, WA.
From the linked article…
We can’t say for certain if it was a dog, or a cougar, or bear. The property is quite far south. There’s wildlife out there. We’re unsure," .
You would think that if it was the dog that killed the girl, it would have a blood on its fur. The fact that the police are leaving open other possibilities would suggest that the dog (deceased per article) may not have been responsible.