Finish the roommate's desperate kitchen advice before the fire alarm goes off.

Honestly, should we call the fire department? I think we should grab the cat and run outside immediately!

Honestly, should we call the fire department?

To form a question with "should", invert the subject and the modal verb (Should + subject + base verb). We do not use "do" or "does" to make questions with modals!

I think we should grab the cat and run outside immediately!

"Should" is always followed by the bare infinitive. It never takes an "-s" ending or uses the word "to".