Please choose the correct ending to complete the given sentence: Uncategorized: [header] How to calm down a playful large dog [title] Take your dog on a long walk. [step] One way that you can work out some of your dog's energy is to take him on a nice long walk. Keep in mind that a stroll around the block will probably not be enough to calm your dog down.

Ending1: Keep him on a leash until he is calm. [substeps] You can start with short walks that last for at least 10 minutes, and do longer walks until your dog begins to stay calm. Ending2: Instead, break down your walk into 20 minutes of running and gentle jogging. As you jog, talk with your dog in your head. Ending3: Make sure that you walk the dog in a well-ventilated area, and keep in mind that even a walk through a street full of heavy traffic can just calm a dog. [substeps] If you're running errands as well, take your dog on a walk. Ending4: You will have to walk with him for about an hour or even go running with him if you are able. [substeps] If you cannot walk your dog due to physical limitations, setting up a long line in your backyard that your dog can run back and forth on may help.

Answer format: ending1/ending2/ending3/ending4