Dogs

Beyond their biological traits, dogs themselves provide several "useful features" to human life:

: Their hearing is up to four times more sensitive than a human's, allowing them to detect high-pitched sounds and soft noises from a great distance [23, 25]. Beyond their biological traits

: Interacting with dogs is scientifically shown to lower cortisol levels (a stress hormone) and increase oxytocin (the "love hormone"), leading to lower blood pressure and improved heart health [10, 14, 18]. Beyond their biological traits