"I bought the larger sized snoozer pet car seat because even though my mini-dachshund only weighs 11lbs., I figured her length would require the larger car seat for dogs 18-25lbs. The car seat is actually big enough to fit both her and our rat terrier at the same time, and they frequently like to ride in the same car seat together, even though we have two. The car seat is quite sturdy and the color is great (although it's more of a khaki than a green color - but that matches my car interior perfectly!). The dogs love the fleece lining and if I leave the seats in the house they will jump right in to sleep in them.
The included seatbelt attachement works okay, but I have had trouble with it because my dachshund likes to circle and make a "nest" before laying down, and usually this means she gets the seatbelt attachment completely wrapped around at least one of her legs.
The carrier for 18-25lb. dogs is a nice size for two small dogs (both around 10lbs.). The only problem I have with is is that it is quite large and if I want to put down the split folding seat in my station wagon, I have to leave up the larger portion of the seats as the car seat will not fit easily on the single seat.
Overall, this is a great product and well worth the money - the cheap $20 & $30 car carriers are not as good in quality as this. My dogs love this carrier!"