Pets can have a positive impact on mental illness in several ways. They can provide companionship, reduce feelings of loneliness and isolation, increase feelings of happiness and well-being, and help reduce stress, anxiety, and depression. Additionally, taking care of a pet can provide a sense of purpose and routine, which can be beneficial for those dealing with mental health issues. Overall, pets can offer emotional support and unconditional love, which can help improve mental health and quality of life.