No, Rishi Sunak is not in trouble with the police if his dog is found roaming in the park. While it is important to obey local laws and regulations when it comes to walking pets, it is unlikely that the police would intervene in this situation. However, if the dog causes a disturbance or poses a risk to other people or animals, then the police may take action. If a complaint is made, the police may investigate and take appropriate action.