Show write box content in rss feed

CMS & WordPress
1

WordPress v3.2.1

I an using a plugin (magic fields) to create write boxes for wp post. The content in the boxes are the only content for each post. Nothing is entered in the tinymce editor. I display the boxes content using a custom template and a custom loop. However, the content doesn’t show up in the rss2 feed, just the post title and post date. Is there a custom function to get all the content to display in the rss feed?

Here’s the loop to get the get the write boxes input to show on each post.

<div class="content clearfix">

                    <?php the_content('Read the rest of this entry &raquo;'); ?> 
                    
                    <div class="image-container dontwrap"><img src="<?php echo get('image'); ?>" alt="" />
                    
                    <p><?php echo get('description'); ?></p>
                    
                        <ul class="info">
                            <li><span>Breed:</span> <?php echo get('breed'); ?></li>
                            <li><span>Age:</span> <?php echo get('age'); ?></li>
                            <li><span>Gender:</span> <?php echo get('gender'); ?></li>
                            <li><span>Spayed/Neutered:</span> <?php echo get('spayedneutered'); ?></li>
                            <li><span>Vaccinations:</span> <?php echo get('vaccinations'); ?></li>
                            <li><span>Good with:</span> <?php echo get('good_with'); ?></li>
                            <li><span>Special needs:</span> <?php echo get('special_needs'); ?></li>
                        </ul>
                    
                    </div>
                
                </div>
2

I forgot to add this to the op.
This is the current function in functions.php that doesn’t work and I’m not sure what to edit to get it to work.

function show_fields( $content ) {
    global $post, $id;
    if ( !is_feed() )
    return $content;
    $attachment = get_post_meta( $post->ID, 'Attachment', $single = true );
    // Print custom fields ***
    if ( $attachment != '' )
    	return __('description') . $attachment;
    if ( $attachment != '' )
    	return __('breed') . $attachment;
    if ( $attachment != '' )
    	return __('age') . $attachment;
    if ( $attachment != '' )
    	return __('gender') . $attachment;
    if ( $attachment != '' )
    	return __('spayedneutered') . $attachment;
    if ( $attachment != '' )
    	return __('vaccinations') . $attachment;
    if ( $attachment != '' )
    	return __('good_with') . $attachment;
    if ( $attachment != '' )
    	return __('special_needs') . $attachment;
}
add_filter( 'the_content', 'show_fields' );