Our car seats arrived yesterday and they’re very nice! Comfy and sturdy (no collapsing sides like some we’ve tried, that leave our pups stressed and anxious) we ordered the small sizes as our pups are 9lbs, 5 and half lbs and 3 lbs. My thoughts were the little ones could share one but I’m thinking I should have ordered the large for sharing.  There is also only one clip for the harness so I may need to rig up another clip if I do let the smaller ones share.  I think the dogs will be quite comfortable and secure in these seats. I also like that they give them some height so they can see out the window.