All news can be boiled down
You can boil down most news to pithy one-liners. Home burgled. Man shot. Research published. Software updated.
You could look at it that way. Or you could look at it like this: we've provided you all the context you need to make a personal judgement.
We think it's news because it's a new technology, it's supposed to be a trusted technology, it caused a death, and so here are all the details we have so you can weigh up whether it was an unfortunate accident or something else.
We always encourage readers to think for themselves. I suspect what you really mean by "this isn't news" is that you were hoping the dog was killed in darker circumstances.
It reminds me of George Carlin's bit about the news:
"I watch television news for one thing and one thing only: entertainment. That's all I want from the news; entertainment. You know my favorite thing on television? Bad news. Bad news and disasters and accidents and catastrophes. I want to see some explosions and fires, I want to see shit blowing up and bodies flying around!
"I'm not interested in the budget. I don't care about tax negotiations. I don't want to know what country the fucking pope is in. But you show me a hospital that's on fire and people on crutches are jumping off the roof and I'm a happy guy! I'm a happy guy!"
As a journalist of 20+ years, it's something I think about a lot, every day.
C.