There are four to choose from

Extra small: 2 -3

undercoat (being wavy) and knots will catch in the comb

They are extra thick

Diameter: 8 cm

K9 Sport Sack Air 2 Size:Extra Small There are four to chooseThe K9 Sport Sack Air 2 is a great place to start for your first pet carrying adventure. This classic model a flexible, breathable and lightweight pet carrier; perfect for shorter hikes, bike rides and any other quick trip or outing you can dream up. Like all K9 Sport Sack models, it was designed under the close direction of veterinarians, dog trainers and outdoor product engineers to be ergonomic, safe and strong. The carrier has an upper limit of 13