"There is a dog in front of our window."
Translation:Vor unserem Fenster steht ein Hund.
That's also a possible translation, in my opinion -- though with es gibt it sounds to me as if the dog is always there, not just right now. (Perhaps a statue of a dog?)
You can report it if you'd like.
If it's a real dog who doesn't stay in front of the window the whole time, but who just happens to be there now, Vor unserem Fenster ist/steht ein Hund would be better, I would say, or even Da ist ein Hund vor unserem Fenster.
(Despite my usual misgivings about translating the "there" in "there is" into German, I think that in this case it would sound more natural than Es ist ein Hund vor unserem Fenster. I'm not sure what the "rules" are for including da.)
It's not completely wrong, and you could report it if you'd like.
But I'd say it's not the best translation.
"There is ...." introduces something new to the conversation, and new things generally tend to go to further to the end in German, e.g. as Vor unserem Fenster steht ein Hund or Es steht ein Hund vor unserem Fenster.