The "smell" center of a dog's brain is 40 times larger than yours.
Dogs can smell thousands of times better than humans. Their noses have millions more scent receptors—for example, a human nose averages 5 million while a Dachshund's has 125 million—making them useful in sniffing out drugs, dead bodies, bed bugs, explosives, and more. Your pets also keep a lot of secrets from you. Here are 50 of them.
No two dog noses are the same.
Dogs dream like people.
iStock/Li Ki Goh
If you've ever noticed your pooch twitching in her sleep, this probably means she's dreaming. Researchers found that dogs have similar sleep patterns and brain activity as humans, and that small breeds tend to dream more than large ones. Psychology Today suggests they're probably imagining familiar activities like playing outside or chasing their tail. These are the secrets your dog knows about you.
Dogs are as smart as a two-year-old baby.
According to canine researcher and author Stanley Coren, your toddler and pup are about on par when it comes to brains. He also explained that man's best friend can count, understand over 150 words, and even trick people or other dogs to get treats. Intelligence varies based on breed—Border collies are the smartest. Watch out for these common signs that your dog is sick.
Dogs only mate twice a year.
Unspayed females only go into heat twice a year, so dog breeders need to plan carefully.
Tail wagging has its own language.
If your dog excitedly wags their tail, it means they're happy to see you, right? Not necessarily. According to Discovery.com, dogs wag their tails to the right when they're happy and to the left when they're frightened. Wagging low means they're insecure; and rapid tail wagging accompanied by tense muscles or dilated pupils can signal aggression. This is why every kid should grow up with a big dog.
Puppies are born blind and deaf.
Newborn dogs are still developing, according to Psychology Today, so their ear canals and eyes are still closed. Most puppies open their eyes and respond to noises after about two weeks.
Dogs have a "sixth sense."
In a 2010 poll, 67 percent of pet owners reported their pets acting strangely right before a storm, and 43 percent said their pets behaved oddly right before something bad happened. The top clues? Whining, erratic behavior, or trying to hide in a safe place. There are even reports that dogs can sense illnesses, like cancer.
Dogs only have sweat glands in their paws.
Even though they sweat out through the pads of their paws, their main form of cooling down is panting.