The California Civil Code lists four subcategories of slander which are termed slander per se. This means that the alleged statement is defamatory on its face. This is important because statements which are slanderous per se do not require proof of actual damages.
What does this have to do with slander per quod?
Well, in contrast to statements that are slanderous per se, statements that are slanderous per quod require proof of actual damages.
This makes a huge difference since it can be very difficult in certain circumstances to prove actual damages.