Due to the previous reviews and have made experiences with Asia - products I ordered for my little Swetna-Bolonka bitch the bag in size L - and that was a good thing. The bag wears great body and my dog has equal terms with her. I bought the bag for longer trips because the dog is 10 years old and do not necessarily have to run 30 km away. Currently, she always used when our lift on strike again (what he does unfortunately often). Because dogs are so much running stairs and we live on the 8th floor, I put it now always in your pocket, because the stairs running for me is better than when I hold them in my arms.