That's the worst part of going to the vet! I had to even cancel an appointment one time because I couldn't get kitty into the carrier. Considering that they are so small, next to us, it is amazing that they have the upper hand but they do! The vet's office was very understanding (I called in plenty of time) and they said they have even had people cancel because they can't find their kitties. Something about the carrier makes them disappear! They suggested next time that I put kitty in a pillowcase and lower him into the carrier. Haven't done it yet but both kitties have appointments on 2/21. This should be interesting! I'll let you know how I do.