[Sukey]

was thinking I'd maybe need a large and a small (or maybe a medium and a small) for my 3 dogs

They are Lilah (yorkie) 4 lbs, Ellie (poodle mix) 9 lbs, and Magnolia (papillon) 9.5 lbs. Magnolia is really long bodied and will probably share the seat with Lilah and will most likely lie down because she gets scared in the car. Ellie looooooves the car and likes to look out the window and stand up