Cats communicate with others through their scents. One of their scent marking behaviors is spraying urine on vertical surfaces such as walls and furniture. Although spraying plays an essential role in the feline world, it often poses challenges for pet owners because of its strong and pungent odor. Consequently, the website is overflowing with posts discussing the issue of cat spraying. Notably, sprayed urine has a more pungent odor on the human nose than normal urine in their litter boxes. While it is believed that sprayed urine contains additional chemicals possibly derived from anal sac secretions, scientific evidence supporting this remains unclear. Japanese researchers examined why the sprayed urine had distinctive smell compared to the normal urine.