If we take this heresay as gospel we have a situation where an on duty officer would have shot the dog, had they thought they could get away with doing so. Additionally they admitted as much in conversation, and I consider speaking about wanting to discharge your weapon during a call to be an action worth note.

Let's raise the stakes for another example. If a cop does a debrief after a routine traffic stop and says, "I was waiting for a reason to shoot this man where he stands", that's a matter of concern. It doesn't matter that the cop did the correct thing this time, because they're showing that the desire to kill someone is the driving force in their actions.