One of the other YT people had a perfect size pool for a small dog. Much easier and smaller than those at the web site you have. They are the one ring pools and work great for our little guys. Here are a couple of links for a few cool pools...
http://search.ebay.com/search/search...rclo=&saprchi= http://cgi.ebay.com/sand-n-sun-one-r...QQcmdZViewItem
Hope this helps. Connie