Well I would do the following changes:
PHP Code:
if($owned_adoptable['isfrozen'] == "no"){
$result = runquery("SELECT * FROM {$prefix}users WHERE username='{$owned_adoptable['owner']}'");
$user = mysql_fetch_array($result);
$reward = clickreward(grabanysetting('rewardmoney'), $owned_adoptable['owner'], $user['money']);
$newamount = $user['money'] + $reward;
runquery("UPDATE {$GLOBALS['prefix']}users SET `money` = '{$newamount}' WHERE `username` = '{$owned_adoptable['owner']}'");
As you can see, the program looks a bit confusing 'cause the adoptable owner's money data cannot be easily retrieved from database. The mysql SELECT query has to be executed and mysql_fetch_array needs to be manipulated. Also the $article_content line is removed for a good reason. Try this on your site and lemme know if it works.