Does Joomla or EasyLayouts have a conditional List or conditional Checkbox field?

For example if I use a checkbox field and I ask "Do you have" pets the choices would be Yes and No. If the user chooses No it outputs No on the submitted form. If they choose Yes it then 3 more choices appear such as Cat? Dog? Other?. If the user chooses Cat then the question "How many?" would appear with a text field to enter the number. The same question would appear for the other choices if selected.

Does this exist and if not is there a way it can be implemented?

Regards Mel