What size should I have on the dog cage?
Width: Measure the dog's chest width and take it times 2.5. The dog must be able to lie down and turn around unhindered.
Height: The height of the dog above the skull (top of the head) when the dog is standing in a normal position.
Depth : Measure the distance between the tip of the dog's nose and the bones of the sit bone when the dog is standing in a normal position. Take this measurement times 1.10
Source: Swedish Board of Agriculture