It's ideal for my 65 lb. rangey mutt, taller and longer than most boxers. He has enough height and enough room to lie down and to turn around. Something to consider is the size and weight for storage. This folded 36" crate is pretty heavy and unwieldy at about 25 lbs. with a soft mat included. Also, any dog has to be trained to be comfortable in a crate (see http://www.humanesociety.org/animals/dogs/tips/crate_training.html ).
Hmm , I wouldn't think so Caitlyn . I use it for my long legged rat terrier for sleeping in but I use a smaller one to transport him . I think boxers have a range of sizes although I have seen some smaller females that were full grown . I would think it could be ok for transporting your dog for for sleeping in I'm not sure but I don't know what your exact plans are . I bought this for my dog to sleep in and he loves it .