Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to build a dog park [title] Building a dog park is time-consuming and exhausting, but may have great benefits in the end. [step] Consider if this is something you really would like to put your time into. [title] If you have decided to move forward with your plans, keep in mind that you will need a large, grassy, open space for dogs to run.

Ending1: [step] You may need up to a few acres, depending on the area and whether your dog park will be open to the general public. Make sure the grass is thick and healthy before moving on. Ending2: [step] Don't have many dogs, just enough space so that they can run, rest and graze. Ideally place some plants along the sides of the space. Ending3: [step] Your space should be big enough to make running a regular habit. You will want at least about 15 foot blocks of raised material for the dogs and a four foot wide space for running. Ending4: [step] It should include room for dogs to run and play during the day, plenty of space for turning in; a driveway is a good option too, preferably several feet deep. [title] Also, think about who you plan to work with.

Answer format: ending1/ending2/ending3/ending4