I adopted a dog several years ago that is claustrophobic and afaid of sounds. He would not use the Dogloo I bought him or go in teh airline style crate. What has worked for him (after about a year and a half)is to have a dog house with a large opening - basically missing an entire wall instead of using a door sized cut out. Also the only way he goes in a crate is if it is a HUGE wire one that he can see out of, otherwise he throws up.
ALso it helped that we got a second dog who is less fearful - she will go anywhere. And the competition between them has led to him going in the dogloo and in the airline crate!