The article states:
A police officer investigating a report of a home burglary mistakenly went to the wrong address and ended up killing a family's dog.
In order to have this discussion we have to assume that the article means what it says. Otherwise we may as well assume none of it is facts and simply discuss how many angels can dance on the head of a pin.
Yes, it's obvious that if he was given incorrect information then the responsibility lies elsewhere. But we are not a board of inquiry, we are people discussing what the article says. And it says he made a mistake.
Maybe it was all his fault. There is certainly no further info stating that it wasn't.
However, I would rather wait until I get better info before assuming it was all his fault. What if YOU were sent to deliver a timely package and given the wrong address ? Later, after getting a call from the angry client your boss calls you in and says, YOU WENT TO THE WRONG ADDRESS. Can we then assume it is ALL YOUR FAULT ?