When you choose a crate it should be sufficient for your dog to stand turn around and lay down in. If you are buying a crate for traveling the airline has various restrictions which you will have to consider separately. Your pet will need to be introduced to a crate slowly and over a few hours although it can vary wildly.
Start out by placing a treat near the crate. Then in the door of the crate then, if the dog takes it with no trouble in the middle of the crate. Each time she gets it praise her and be patient don't push him. After a few of these then place it in the back of the crate and swing the door shut a little.
Gradually work until your able to shut the door without him getting nervous and finally latch it. Continue stepping up the amount of time she is latched until your able to leave the room without incident. Be sure to place his favorite toy and a little bed in there with him and he will eventually be good to go overnight.
Good luck and as always feel free to send me any questions.
professional dog trainer with Artisan dog training
Lexington / Nicholasville