<?php
    $args = array(
	'post_type' => 'animals',
	'orderby' => 'rand',
	'tax_query' => array(
		array(
			'taxonomy' => 'animal_type',
			'field'    => 'slug',
			'terms'    => 'dogs',
		),
	),
);
    echo build_query( $args );
?>