In this lab, students use their microscope skills to step into the role of veterinarians diagnosing common pet illnesses. After reviewing how bacteria and fungi appear under the microscope, they examine prepared slides from real-world case scenarios—such as a dog with an ear infection, a cat with diarrhea, or a puppy with a skin abscess. By carefully observing the shapes and structures they see (like bacterial cocci, rods, or fungal yeast cells), students determine whether the infection is bacterial or fungal. They then connect their microscopic observations to the symptoms described in each veterinary case. This process helps students practice not only accurate microscope technique but also diagnostic reasoning, as they link cell type to disease and treatment options. In doing so, they apply classroom learning to authentic veterinary contexts, reinforcing how microbiology directly impacts animal health.