Kind of odd when one description is like this;
Code:
<div id="indexProductListCatDescription" class="content"><font face="arial,helvetica,sans-serif" size="2">Get a trendy collar and matching leash to walk your dog in style.</font></div>
and the stretched one looks like this;
Code:
<div id="indexProductListCatDescription" class="content"><table class="a" border="0" cellpadding="0" cellspacing="0" width="550"><tbody><tr><td align="left" valign="top"><h5><p><font face="arial,helvetica,sans-serif">Most of our dog jewelry is handmade to assure lasting quality and craftsmanship. We select quality stones such as Swarovski crystal and rhinestones. We have our own designer and jeweler who make sure that the quality of construction will last. &nbsp;We strive to create unique designs in dog necklaces, hairpins and pendants. We are probably the top company in designing and creating fashionable dog jewelry with quality stones, unique styles, and quality workmanship. Our motto is to give value and quality in the same piece of jewelry.</font></p></h5></td></tr></tbody></table></div>
I don't know what's with the table, but bolds tag via the HTML editor would have accomplished the same idea.

Also you're layout is set at 750px, but your header image is 848px .