There are many shapes and sizes of dog crates to choose from. However, it is not the shapes that really matter but the dog crates sizes. A dog is likely to see this as his den. Dogs have this natural need to have a den. Having said that, it can be concluded that a crate can be the dog's shelter. In this case, the crate should be enough to make the dog feel comfortable and protected.
What crate size is best for your dog. There is no hard and fast rule for this. obviously it is the purpose of the crate and the needs of the dog that will weigh the heaviest. See some related readings through https://www.britannica.com/sports/dog-show.
Technically, you would want to start with your dog's size and weight and to learn how to measure that there are helpful resources that you can find on the internet. You can also find suggestions of the right crate size for your dog through the internet. As a tip, the crate should be 2-4 inches taller than the dog's head when he is in a standing position. Take note that the height of the ears should be considered if the ears are erect. The dog's full length from the tip of his nose to the tip of his tail is not the right measurement for choosing the width of the crate from dogcratesizes.com/dog-crate-sizes-guide/. Just take the measurement that starts at the dog's nose to the base of his or her tale. Take that length and again add 2-4 inches. you may have to add a couple of inches more if the dog has thick tail. Also take note of the space that your dog needs when he seated. If ever it would be somehow impossible to take the measurements of the dog, the owner can ask the manufacturer of dog crates or the dog's doctor for a recommendation.
Needless to say the tips above should give pet owners a better idea on dog crate sizes. Again, what is best for other dogs may not be good for your dog. Always take note of the function the crate will serve and the dog's needs when choosing dog crate sizes from https://dogcratesizes.com/.