Let's face it, they don't call dogs "man's best friend" for nothing. They are sweet, they love us, and they do work for us. There is simply nothing better than a dog. If humans have learned to survive against saber-toothed predators, stampeding herds, and enduring famine, dogs have been right there. As Robin to our Batman, as Scooby Doo to our Shaggy, dogs have been there through thick and thin in our darkest hours. After all we've been through together, how could anyone disagree that dogs are the best pet any human could have? (BOLDED PARAGRAPH) First, we get massive health benefits from dogs. They calm us down when we are stressed. Countless service dogs are trained every year to go into nursing homes and other facilities to provide comfort to patients. These therapy dogs have been shown to lower blood pressure and calm distressed patients. Dogs also bring sweet, sweet bacteria into our homes. These bacteria help build our immune systems and make us healthier. Studies have shown that people with dogs get sick less often. In addition, growing up with a dog in your home may make you less prone to dog-related allergies as you grow up. Finally, because dogs need regular exercise, dog owners tend to be more fit than those who do not own dogs or own only cats. (END OF BOLDED PARAGRAPH)

Second, dogs just make us happier. New studies have found a lower rate of depression in dog owners. In part because dogs force their owners to be more active, it is likely that dog-owners just cannot stay cooped up at home all the time. This activity level also makes it easier to meet people, stay socially engaged, and feel a sense of belonging. They are dependable friends as well, always ready with a sympathetic ear, a soft belly to rub, and a willing smile. If your day seems like a version of the zombie apocalypse, ten minutes of playing fetch will certainly keep those zombies at bay until you can get back in the game.

Finally, it's all about cute. Sure other pets can be cute, but consider tail wagging. What other animal has such a universally understood expression of joy? How can you not give into that sweet face, holding a stick, waiting patiently to be taken out to play? And if you have any doubts, you must not have seen a dog rolling on its back, tongue lolling about, head swishing back and forth, scooting first one way and then the next as if competing in a silly worm dance.

Many cat owners may argue with this position, but dogs really are the best companions. They bring joy, like a bluebird brings spring, or a rainbow brings a promise. They teach us about patience. They teach us about faith, waiting patiently—no matter how many times we leave without them—for that one time they get to load into the car and go with us. Always ready to go, always ready to wait longer, they make us hurry home at the end of the day for just a little unconditional love.

What is the main idea of the paragraph in bold? (1 point)

Dogs improve human health.

Dogs reduce stress in humans.

Dogs are used in service at nursing homes.

Bacteria from dogs help us become stronger.