CheckBoxList contains rule

Hey,
having a CheckBoxList, like []horse []dog []mouse and text input color which I want required in case when the “dog” checkbox is checked. So in case [x]horse [x]dog []mouse fields are checked, the color is required. It could be like

<?php
$colorControl
	->addConditionOn($animalsControl, Form::CONTAINS, 'dog')
		->setRequired();
?>

But it appears like there's no rule that fits. EQUALS does not make the job.
Has anybody dealt similar problem?

Thank yo