Pets can have both positive and negative effects on home cleanliness. On one hand, pets can create messes such as shedding fur, tracking in dirt or mud, and knocking over objects. However, pets also provide emotional support and companionship, which can positively impact mental health and overall well-being. To minimize the negative effects on home cleanliness, regular grooming, cleaning up after pets, and training them to follow house rules can help maintain a clean living environment.