Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to housebreak a dog using a crate [title] Pick a crate that is the right size. [step] A crate should be just big enough for your dog. If it's too small, your dog will be uncomfortable.

Ending1: For more space, feel free to use bigger crates. Select crates that are a bit bigger so your dog can stand when you stand. Ending2: If it's too big, your dog will have space to use the bathroom in the crate and still have a clean area. It should be big enough for your dog to sit up, stand up, lay down, and turn around, but no bigger. Ending3: Choose a crate that is wide enough for your dog to stand and turn around in. That way, it doesn't have to be a toy crate just for your dog. Ending4: Larger crates are better suited for longer trips. [substeps] You should always have heavy bags in the crate.

Answer format: ending1/ending2/ending3/ending4