Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to encourage your dog to sleep in your bed [title] Allow your dog to sleep in the room. [step] Do not invite your dog into the bed with you right away. For several reasons, this is a bad idea.

Ending1: Your dog will always associate sleeping in your bed with comfort and routine, and then might find the middle of your bed uncomfortable. The best strategy is to keep your dog away from your bed and allow your dog to sleep in the room with it at the same time. Ending2: [substeps] Your dog might not feel comfortable sleeping there. This might be due to your chance of startling them by turning off the lights in the room. Ending3: Your dog could accidentally come into your bed with you; by opening the door, you will cut off the dog's access to your bed. You want your dog's head positioned high enough to hear you coming to bed. Ending4: You need to ease your dog into sleeping in your bed. Start by letting him in your room at night.

Answer format: ending1/ending2/ending3/ending4