Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train your dog from running out of your house [title] Look for and reward natural sitting behavior. [step] If you walk into a room and your dog sits, then your job is half done. Reward your dog when it sits, even if you don't issue the command to sit.

Ending1: Give your dog a treat when it sits in front of you. [title] Begin issuing the " sit " command. Ending2: Let it know that it will be rewarded when it follows your commands. But keep in mind that punishment will be physical for your dog when it sits. Ending3: Only do what seems natural and healthy to you. [title] Watch for signs your dog is going to use the bathroom. Ending4: Your dog will not quickly learn to sit and stalk you until you tell it to sit. [substeps] Reward your dog with a treat once he sits where you have told it to go.

Answer format: ending1/ending2/ending3/ending4