> I've searched with no success, and need a solution
> for my problem.

You didn't search very hard.  
Incremental search - <http://forum.httrack.com/readmsg/9544/index.html>

> I want to download large amount of pages, such as:
> <http://my.domain.com/?type=animals&AnimalID=1>
> <http://my.domain.com/?type=animals&AnimalID=2>
> ...
> <http://my.domain.com/?type=animals&AnimalID=1000>

cmd:
for /l %A in (1,1,1000) do echo
<http://my.domain.com/^?type=animals^&AnimalID=%A> >>tmp.txt
notepad tmp.txt
select all and copy
httrack paste url