It's quite simple really. Go to your myadopts.php file, find where it says:
if($act == ""){
// No action specified, we just show all the adoptables with a manage link
$article_title = $loggedinname."'s Adoptables";
$article_content = $lang_adoptmanagement."<br>";
And just take out the <br>
The reason it is set up this way, is because the adoptables information can make the tables rather large, so the best option would be to have go Vertically instead of horizontally.
A quick update:
After you edit that part of the code, scroll down a little bit, until you find this:
// Our code to determine if we show the table or not...
$article_content = $article_content."<table width='440' border='1'><tr>";
// Output the table information...
// Get the current adoptable's image
$image = getcurrentimage($aid);
$article_content = $article_content."<td><div align='center'><p>".$name."</p><p><a href='myadopts.php?act=manage&id=".$aid."'><img src='".$image."' border=0></a></p><p>
<b><a href='myadopts.php?act=manage&id=".$aid."'>Manage</a></b></p></div></td>";
$article_content = $article_content."</tr></table><br>";
$i++;
}
The last '$acrticle_content' needs to be changed to this:
$article_content = $article_content."</tr></table>";
You could also, change the size of the table to a smaller size, so that they could fit. This all of course, depends on the size of your adoptables image.