Once you've got your navigation on the page, you'll need to add a headline, so that your readers know what's going to be on the page. You can use any header from <h1> through <h6>, but it's best to stick to a hierarchy. In other words, use <h1> as your main title, then <h2> as your sub-title, and <h3> as a section title and so on.
For this site, label your page "My Pets", and put it in the <div id="main"> section:
<h1>McKinley, Shasta, and Other Pets</h1>