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The most common types of emotional support animals are, of course, ESA cats and ESA dogs. Anyone who has browsed the internet for more than a few minutes knows what cats are most famous for: funny online videos. Sure, the ancient Egyptians held cats in high esteem, but that’s because they never had the wonders of YouTube.

The long and short of it is that with ESA cats, you know what you’re getting: Comedy Central on four legs. With ESA dogs, however, there’s more going on behind those big brown eyes than you may think. From their history to their behavior to their bodily functions, dogs are truly fascinating creatures.

If you’re choosing an emotional support dog as your next furry companion, here are some facts you may not believe.

Dogs Evolved from Wolves

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Domestic emotional support dogs evolved due to the needs of both man and beast.

A commonly held theory regarding the origin of the domestic dog considers a lineage that can be drawn back thousands of years to the gray wolf. Although the details vary, the general notion is that domestic dogs evolved due to the needs of both man and beast. As treacherous environments and weather conditions posed a great threat to wolves, an equal threat troubled man in the form of wild predators. But through feeding and sheltering wolves, it became a win-win: The wolves learned that by protecting man, they would more easily be able to survive — and vice versa.

They Curl Up For a Reason

On a related note, you may notice that your emotional support dog often curls up when they go to sleep. This sleeping position isn’t just for comfort but is a natural instinct hearkening back to when dogs roamed the wild, fending for themselves. This instinct can still be found in ESA dogs today, as it’s used to keep their bodies warm as well as protect their vital organs while they sleep. No matter how nurtured they are, dogs will always have their roots planted within nature.

Their Noses Are Super

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The moisture on a dog’s nose helps capture scents and hold them for extended periods.

Most people know that a dog’s sense of smell is far greater than that of humans. But did you know that a dog can smell anywhere between 10,000 to 100,000 times better than us? To put that into context: If we’re able to detect a teaspoon of sugar in our morning coffee, a dog can detect that same teaspoon in a million gallons of water. The infamous wetness of pooch’s nose enforces this mighty sense of smell, too. The moisture helps capture scents and hold them for extended periods.

And Did You Nose This?

Their nostrils are multifunctional. A fold of tissue just inside their nostrils separates the odor from the air used for respiratory breathing, allowing the emotional support dog to break down every single detail about the scent. Another impressive feature is that ESA dogs can actually smell fear. It’s a common expression but surprisingly quite literal among dogs. Fear in humans causes a change in blood flow that pushes chemicals to the skin’s surface that ESA dogs are remarkably able to sense, which means they can actually smell your emotions.

Not Every Dog Can Bark

For any lifelong dog owner, this may seem like a ridiculous statement. Next, we’ll be saying that not every baby cries. But the dog thing really is true. The Basenji is a breed of dog that is incapable of barking. This distinctive trait has given them the nickname “soundless dog.” But it gets more interesting than that. Although they can’t bark, they do have an alternative method of communication: yodeling. That’s right! Basenjis can hold their own in a yodeling contest against even the Swissiest of Swiss.

They’re Sensitive to Magnetic Energy

Like the X-Men villain Magneto, dogs have magnetic sensitivity. Studies have shown that many actions taken by our cuddly companions align with the Earth’s magnetic field. Next time you look over at your emotional support dog relieving itself, consider that the direction they’re facing to poop isn’t always random but influenced by an invisible magnetic field that extends from our planet’s interior into outer space.

And That Isn’t the Only Kind of Magnetic Energy

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More than 80 percent of people feel more confident approaching an attractive person if they have their dog with them.

Although admittedly not about dogs themselves, this is something to keep in mind for all those single guys seeking an emotional support dog: Studies have shown that if you have a dog with you, you’re three times more likely to get a girl’s phone number. That’s right, fellas: If you’re seeking human companionship, too, don’t forget to bring your pooch along. According to another survey, 82 percent of people feel more confident approaching an attractive person if they have their dog with them.

If you’re looking for some tender loving care, an emotional support dog will never let you down.