I have a medium Pet Gear seat that stays in backseat of my car all the time.
I bought a medium snoozer (with a storage drawer) for when ZoE goes in other vehicles, thinking it would be the same size and it's not, it's quite a bit bigger. Two small yorkies could easily fit in the medium snoozer. ZoE's a teapot (tall & long) and she has plenty of room to stretch all the way out in it.
You can buy additional fasteners for the snoozer to hold another dog.
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