> I start to download using 
> <http://www2.asiadog.com/gallery>
> 
> There are numerous photos in this directory but I
> could download ...why?> 
> The web seems to store all photos in the 
> <http://www2.asiadog.com/gallery/photos/> xxxyyyy...

Links in gallery lead to random entries not all entries.
When I looked, no links in gallery lead to photos/1009.
There is a form but httrack does not fill out forms.

Try starting at:
<http://www2.asiadog.com/gallery/index.php?action=showgal&cat=1009>