Question

Please, take an umbrella - it (to rain cats and dogs) outside

Answer 1

It is raining cats and dogs outside.

Answer 2

Of course! It sounds like it's raining heavily outside. You might want to take an umbrella with you to stay dry. The phrase "it's raining cats and dogs" is often used to describe very heavy rain. So, it's definitely a good idea to grab that umbrella before heading out. Stay safe and dry! If you need any more assistance, feel free to ask.