The idiom is 'It's raining cats and dogs', and your question should be:
'Do native speakers use this idiom (nowadays)?'
And the answer is - not really. English language textbooks love this expression, and whenever anyone brings up the subject of English idioms, or asks for examples of idioms, this one is always first on the list. However, the truth of the matter is that we don't really use it. We are all aware of it, and native speaker teachers will often eagerly teach this to students as an example of how funny our expressions are, but you never actually hear it in everyday speech. I've never said this in my life, and probably never will.
A more normal expression would simply be, for example: 'It's absolutely pouring down' or 'It's really tipping down'.