Yes, the dog is house-trained. It has been taught to go to the bathroom outside and knows to wait until it is let out. The dog understands the rules of the house and follows them consistently. **

There could be several reasons why your dog is not going into the dog house. It's possible that the dog house is too small or uncomfortable for your dog, or it may not feel safe or secure inside. Your dog may also prefer being closer to you or other family members instead of being in the dog house. Additionally, if the dog house is too hot, cold, or lacks proper ventilation, your dog may choose to stay outside instead. **

No, dogs do not need an S-Bahn ticket in most cases. Small dogs that can be carried in a bag or on a leash may travel for free on public transportation in many cities. However, larger dogs may require a reduced fare ticket or a separate ticket depending on the transportation provider's rules. It is always best to check with the specific transportation company for their pet policy before traveling with a dog. **

When dog sitting a young dog that is not house trained, it's important to establish a routine for potty breaks. Take the dog outside frequently, especially after meals, naps, and playtime. Use positive reinforcement, such as treats and praise, when the dog goes to the bathroom outside. Supervise the dog closely indoors and watch for signs that they need to go outside. Accidents may happen, so be patient and consistent with training. Consider using puppy pads or crate training to help with the process. **

It is unclear from the information provided whether the dog is house-trained at the family's friends' house. The dog's behavior of urinating on the carpet suggests that it may not be fully house-trained in that particular environment. It is possible that the dog is not used to the new surroundings or may be feeling anxious, leading to accidents inside the house. It would be helpful for the family to monitor the dog's behavior and provide additional training or support as needed. **

Yes, it is possible to be with a companion dog, assistance dog, therapy dog, etc. in an airplane, supermarket, etc. without relying on the help of the dog. These dogs are trained to provide support and assistance to their owners, but their presence alone can also provide comfort and emotional support. In the case of assistance dogs, they are trained to perform specific tasks to help their owners with disabilities, but their presence can also provide a sense of security and independence. In the case of therapy dogs, their presence can help reduce stress and anxiety in various environments. Therefore, even if the individual does not rely on the dog for specific tasks, their presence can still be beneficial in these settings. **

There could be several reasons why your dog is not house trained. It could be due to a lack of consistency in the training process, not providing enough opportunities for your dog to go outside to eliminate, medical issues such as urinary tract infections or gastrointestinal problems, or anxiety or stress causing accidents. It's important to identify the underlying cause and address it accordingly to successfully house train your dog. **

To house-train a dog, you will need to establish a routine for feeding, potty breaks, and playtime. Take your dog outside frequently, especially after meals and naps, and praise them when they go potty outside. Use positive reinforcement such as treats and verbal praise to reward good behavior. Be patient and consistent with your training, as it may take some time for your dog to learn. **