Please choose the correct ending to complete the given sentence: Education and Communications: [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.

Ending1: Based on your measurements, purchase dog boxes with steps and side rails to enable your dog to run, jump, and climb. [title] Measure and mark the length and depth of your box. Ending2: 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. Ending3: You'll know it's too small when you take your dog outside, particularly if he or she is taller than you. [substeps] Determine how big your dog will fit inside the box. Ending4: [title] Decide what style of box you want your dog to occupy. [step] Will it be a fringe box, a chest box, a basket, or both? What style of dog box does your dog prefer? Remember that your dog will receive a lot of extra attention when it is in a box.

Answer format: ending1/ending2/ending3/ending4