There are a number of reasons why a dog may choose to sit in the corner. Here are some common causes of this behavior and how to address them:

1. Seeking attention: If your dog sits in the corner and looks at you, they may be seeking attention. Dogs are social animals and crave interaction with their owners. If your dog is not getting enough attention, they may try to get it by sitting in the corner and looking at you. To prevent this behavior, be sure to provide your dog with plenty of attention, including playtime, exercise, and training.
2. Seeking solitude: On the other hand, if your dog sits in the corner and seems to be avoiding interaction with you, they may be seeking solitude. Dogs may do this if they are feeling overwhelmed, anxious, or stressed. To prevent this behavior, it is important to provide your dog with a quiet, comfortable place to retreat to when they need some alone time.
3. Marking territory: Some dogs may sit in the corner as a way to mark their territory. Dogs have scent glands in their paws, and when they sit in a particular spot, they may be leaving their scent behind to mark the area as their territory. To prevent this behavior, be sure to provide your dog with plenty of opportunities to mark their territory outside and to give them plenty of positive reinforcement for using the bathroom outside.
4. Medical issues: In rare cases, a dog sitting in the corner may be a sign of a medical issue. If your dog is sitting in the corner and not responding to you, or if they are showing other signs of discomfort or distress, it is important to consult with a veterinarian to determine if there is a medical issue that needs to be addressed.

In conclusion, there are a number of reasons why a dog may sit in the corner, including seeking attention, seeking solitude, marking territory, and medical issues. To address this behavior, it is important to consider the individual needs and characteristics of your dog and to consult with a veterinarian if necessary. Providing your dog with plenty of attention, a comfortable place to retreat to, and positive reinforcement for appropriate behavior can help prevent this behavior.