If a dog is reported to be scratching a lot, which system should be checked during the examination?

When a dog is reported to be scratching frequently, the most relevant system to examine is the integumentary system. This system includes the skin, hair, and associated structures like nails and glands. Scratching often indicates potential issues related to the skin, such as allergies, infections, parasites (like fleas or mites), or irritations. By examining the integumentary system, a veterinary technician can look for signs of inflammation, lesions, or other skin conditions that could be causing discomfort to the animal.

In contrast, while the respiratory, digestive, and musculoskeletal systems are important to overall health, they are less directly related to the symptom of scratching. The respiratory system focuses on breathing and airways, the digestive system deals with nutrient absorption and gastrointestinal function, and the musculoskeletal system encompasses bones and muscles. These systems may reveal other health concerns but are not typically associated with the behavior of frequent scratching. Thus, the integumentary system is the most logical focus for this particular symptom.