http://tatoeba.org/eng/sentences/show/10486
It's a question...

Really? I don't think so.

It *is* a question.

It wouldn't be a question if there had been a first part to the sentence. For instance:
He doesn't know how old that dog is.

But, if it were a question, it should have been phrased differently:
How old is that dog?

So, as it stands now, something is wrong with this particular variant.

Eldad, and couldn't this be an exclamation?

How old this dog is! (I say this because the Polish sentence indirectly linked to this sentence has an exclamation mark)

Yes, indeed!
So, the period would have to be replaced with an exclamation mark.

But astonished I can state: "How old that dog is."

(yes! I didn't see your comment about the exclamation mark - replied before I saw your other comment).

Yes, perhaps it'll be better with "!"

Espi, you couldn't say that with a period at the end of the sentence. You say that yourself - you're astonished :) So, being astonished, would only a period suffice to express your feeling? :)

I've already changed my sentence. Thanks for the explanation ;)

Can you see the French translation? I know they are linked...

The French variant cannot be seen here. Are they really linked?

Yes! Look at the logs...

Yes, you're right. But it was unlinked (I guess it was unlinked because it underwent a change, from a question to an exclamation... :-))

Ahh, you're right! Thank you! :)