We have the Kittywalk Deluxe SUV Pet Stroller, it doubles as a carrier, and has been so handy when going places. There's plenty of room for the both of them inside. One can be in the screened area while the other one rests privately in the back part. We have the blue one, the pink one was too eye catching. Our girls love it ! Check it out at
http://www.kittywalk.com