Having a pet is a great way to relieve stress and stay healthy, provided they are a good fit and the owner can provide for the petâ€™s needs. Pets can give us a sense of purpose and responsibility. Daily walks with a dog are great for the cardiovascular system and help boost mood. The playful antics of pets can make us laugh so hard we cry, thus boosting our immune system. Â Even watching fish in a tank for 30 minutes can decrease cortisol levels even more so than spending time with a spouse. Overall, pets decrease our blood pressure. They lower our cortisol levels which in turn lessens depression.Â Interactions with pets can increase our oxytocin levels and cause the release of endorphins and the neurotransmitter dopamine, thereby improving, our ability to relax.Â Pets bring us joy and happiness and brighten our days.