Give your dog enough room to lie down and shift position without the box taking up unnecessary space in your vehicle or living space. [substeps] For height, have your dog sit on its rear legs.
[header] How to build a dog box [title] Determine how much space your dog needs. [step] Make sure your dog has adequate room inside the box to be comfortable. Measure your dog to determine the minimum height, width, and depth that your box needs to be.