If she is a grownup, you will need to measure her length and height.(I suggest having some treats to hand!) Measuring the width of your pet is not necessary, as when you have the right height and length, the width will undoubtedly be proportional.
To create things easier for you, you can have your pet stand against a wall (preferably in a corner, with her bottom from the wall). This way, you are able to mark the measurements and move out the measuring tape after. To really make the marks, be sure to use something which rubs off after, like chalk.Length
To accurately measure the size
of your pet, get her looking at all paws and measure from the tip of her nose to the bottom of her tail. You may not need to add the whole length of your dog's tail, or the crate will undoubtedly be too big.
Next, add 2 inches (5 cm) for smaller dogs, and 4 inches (10 cm) for larger dogs to allow her ample moving room, and you've got the minimum length* for the dog's crate.
Now, get those treats out and tell your pet to sit. Measure her in this upright position from the ground to the tallest point of their head (if your dog's ears are erect, measure as much as to the tip of the ears!)
Again, add 2 - 4 inches, and you've got the minimum height* for the crate.