If your dog is running away every time you open the door, it's important to address the behavior and find a solution. Here are some tips that might help:
Teach the "come" command: Start by teaching your dog the "come" command, so you have a way to recall them if they run out the door. Use treats and positive reinforcement to encourage your dog to come to you.
Train with controlled exits: Gradually increase the difficulty of your training by having someone hold the dog while you open the door just a crack, then slowly increase the opening. Reward the dog with treats and praise when they stay calm and don't run out.
Exercise and mental stimulation: Make sure your dog is getting enough exercise and mental stimulation to reduce their excitement levels. This can include walks, playtime, and puzzle toys.
Create a barrier: You can use a baby gate or a crate to create a physical barrier that will prevent your dog from running out the door.
Consult a professional: If your dog's behavior is particularly severe or persistent, consider seeking the help of a professional dog trainer or behaviorist. They can help you understand the root cause of the behavior and develop a tailored training plan to address it.Remember that training takes time and patience, so be consistent and persistent in your efforts. With the right approach, you can help your dog overcome their fear of doorways and develop good behavior.