ANWADog Bed Medium Size Dogs, Washable Dog Crate Bed Cushion, Dog Crate Pad Large Dogs Medium Grey

My pups is 45 lbs, Which size should I choose, Is this dog bed soft and comfortable enough for my dogs?

Does this have a chemical smell, or cancer warning label on the packaging?

Are there color options?

I can’t figure out if the pillow in the center comes out. Or is it all one piece? My dog tends to slide in between and can end up laying on the floor.