NIBESSERDog Car Seat, Dog Booster Seat, 2-in-1 Car Seat Bed for Dogs with Storage Pocket Waterproof Non-Slip Pet Car Seat for Small Medium Dogs Safe Comfortable Removable Cover & Cushion (Gray Green)

Q: Is it high enough for my dog to be able to see out the window? My dog is a 20 pound Maltipoo, he's more poodle so he's got long legs.

It depends mostly how high the cars seat is .. laying down probably not.. stand up maybe yes..

Q: What is the largest dog that will fit in this car seat?

I purchased this for my Chiweenie. She's a Chihuahua/Dachshund mix. She's a little long and weighs 13 pounds (a little over weight). It fits her perfectly and she loves the car seat. We use it in the house also. I'm so glad the old one broke on our way to Florida. Love it. We store her leash and squeaky toys in the side pocket. Can't use it for treats. She'll eat them all, lol.