I believe the answer is administrative<span> regulations. The primary source of law will include all laws/regulations that are formally issued by the Government. Examples of primary source of laws are Treaties, administrative regulations, decision made by the court, legislatures, and executive orders.</span>
Maybe try to give them both treats to make them happier and your chihuahua has to at some point get along with your kitten. Try to get them to be alone maybe or let them get used to eachother.