. Pets --- not service animals, but unregulated pets --- have been carried in sleepers recently, before the official change in Amtrak pet policy. It seems that none of these changes is official. Changes in policy and practice seem to be introduced without advance notice to onboard crews. In short, I don't know what you can expect.
Wait a minute! Whaaat?
My primary recommendations are 1. Don't do coach with out earplugs, eye mask, and a great pillow and blankie. 2. If more than one person don't do roomette unless you are both very short. 3. If you are flexible on date check amsnag for off peak dates, and you can find bedrooms available for $332 depending on direction of travel.