Pets reduce stress in humans for several reasons. The companionship and unconditional love provided by pets can help decrease feelings of loneliness and anxiety. Interacting with pets, such as petting them or playing with them, can release oxytocin and reduce levels of the stress hormone cortisol in the body. Additionally, caring for a pet can provide a sense of purpose and routine, which can help individuals cope with stress and feel more grounded. Overall, the bond between humans and their pets can have a calming and therapeutic effect on mental and emotional well-being.