One of the greatest obstacles in modern veterinary science is the "fear response." An animal that is terrified is not only dangerous to handle but also physiologically compromised. Stress hormones like cortisol and adrenaline alter heart rate, blood pressure, and even immune function.
In modern veterinary science, behavior is often considered the "fifth vital sign," alongside temperature, pulse, respiration, and pain. Because animals cannot verbalize their discomfort, their actions serve as their primary language.
: Focus is often on resolving "undesirable" behaviors (like barking or anxiety) that might otherwise lead owners to surrender their pets.