If my sibling turned into a dog, it would be a very unusual and extraordinary situation. In such a hypothetical scenario, my primary concern would be for their well-being and safety. As a responsible and caring family member, I would do my best to ensure their needs are met and that they are properly cared for.
Walking a dog is a common way to provide exercise and mental stimulation for them, so yes, I would likely take my sibling (now a dog) for walks if that is what they needed and enjoyed. However, it's important to remember that a dog also requires proper training, socialization, and care beyond just walking, so I would make sure to learn about dog care and provide the necessary attention and support to my "sibling-dog" in this hypothetical scenario.
Of course, this situation is entirely fictional, and in reality, such things do not happen. Nonetheless, it highlights the importance of being there for our family members and loved ones, even in the most unexpected and challenging circumstances.