> <http://www.dogsite.nl/showkennel.php> ) I get a

That is an xml page not html. Therefor httrack may not be able to handle it.
Make sure you have links -> Attempt to detect=checked

Entries look like:
<URL><![CDATA[http://www.el-tayranils.nl]]></URL>
<FotoA>t_5351.jpg</FotoA>

A html page would have
a href="www.el-tayranils.nl">< img src="t_5351.jpg">< /a>