How much do you really know about dogs?

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This quiz will test your knowledge of dog trivia — so find out if you really are your dog's BFF.

Question 1 of 16

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dog nose in grass
Humans have 5 million smell-detecting cells in our noses. Dogs have how many?

Dogs have an average of 220 million smell receptors in their noses, with the number varying among different breeds. The part of the brain that interprets smell is proportionally 40 times larger in dogs than in humans. This means that dogs sense and "see" the world in a vastly different way than we do.

Question 2 of 16

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black dog tongue
Which breed of dog is famous for having a black tongue?

While many breeds and mixed breeds of dogs sport a black or spotted tongue, the breed most well known for the trait is the chow chow.

Question 3 of 16

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labrador dog in hallway
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What does BSL stand for?

BSL stands for breed-specific legislation, which places restrictions on owning certain breeds of dogs, usually bull terrier breeds and mixes stereotyped for being aggressive. The American Humane Association states that BSL does little to improve dog bite incidents and is expensive and difficult to enforce. About 700 cities across the U.S. have some form of BSL.

Question 4 of 16

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dog running in field
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Through what part of the body do dogs sweat?

Though dogs cool down is through panting, they also have another way to cool off: they sweat through their paws. Because it does little good to have sweat glands where a thick coat of fur is located, dogs have most of their sweat glands around the pads of their feet. This is why you might see damp paw prints left by your dog as he walks across a hard surface on a hot day.

Question 5 of 16

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small dog breeds
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What is the smallest breed of dog in the world?

The smallest breed of dog in the world is the Chihuahua, which averages only 6-9 inches tall and weighs only 4-6 pounds. In fact, Guinness Book of World Records' smallest living dog is a Chihuahua named Miracle Milly. She is only 3.8 inches tall and weighs about 1 pound. However, the smallest dog ever on record was a Yorkshire terrier named Sylvia, who was only 2.8 inches tall and 3.75 inches long. She died in 1945.

Question 6 of 16

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dog holding leash
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What training style have trainers like Karen Pryor, Patricia McConnell and Victoria Stilwell helped to make popular?

Positive reinforcement training is on the rise thanks to these and many other trainers. This technique focuses on providing rewards for behaviors you want your dog to exhibit through strategies such as clicker training. It avoids dominance or "alpha dog" strategies that can create fear and mistrust between a trainer and a dog, and instead focuses on rewards that generate trust and willingness.

Question 7 of 16

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dogs running together
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Which word does not apply to a group of dogs?

A "pack" generally refers to a group of wild dogs while a "kennel" refers to a group of domesticated dogs. A "cowardice" refers to a group of stray mutts or curs. The only word that doesn't refer to a group of dogs is "gang," which is actually used for buffalo, elk, turkeys and of course, humans.

Question 8 of 16

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puppies in a litter
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When puppies are born, which senses are not yet developed?

Puppies are born with their eyes closed and ears sealed. They do not open and begin to use their eyes until about 9-12 days old, and at about 12-17 days old, their sense of hearing develops. Until then, they must use their sense of touch and smell to navigate their world.

Question 9 of 16

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How many breeds of dog does the American Kennel Association currently recognize?

The AKC currently recognizes 178 breeds, but this is just a fraction of the number of dog breeds recognized worldwide. The World Canine Organization, known as the Fédération Cynologique Internationale (FCI), recognizes 339 breeds. And that's still not counting all the breeds that are still being developed and specialized by breeders.

Question 10 of 16

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jack russell terrier peeing
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Why do male dogs lift a leg to pee?

A scent mark is filled with all sorts of information that other dogs can "read" including the health, fitness and even mood of the marking dog. In addition to internal information, a scent mark indicates the size of a dog based on how high the mark is left. So male dogs raise their leg to leave a mark as high as possible and "look" bigger to future sniffers. Some experts also speculate that the higher a mark is, the easier it is for the scent to reach other dogs on a breeze.

Question 11 of 16

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dog snarling
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What is the most human-aggressive breed of dog?

In a study of 6,000 dog owners published in the journal Applied Animal Behavior Science, researchers found that the dachshund is the most aggressive dog: 1 out of 5 bit or tried to bite a stranger and 1 in 12 bit or tried to bite their owner. Chihuahuas were second and Jack Russell terriers were third. But these less serious bites tend to go unreported, shifting statistics on aggression toward larger dogs.

Question 12 of 16

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dogs in a shelter
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What color dog has the hardest time getting adopted from shelters?

Animal advocates point out that, while every bit as wonderful as other dogs, black dogs have the hardest time getting adopted from shelters. The reasons could be related to the mythology and superstitions placed around black animals, including dogs, for thousands of years. It could also be because black dogs don't stand out as much as lighter colored dogs. Shelter workers call the dreaded phenomenon "Black Dog Syndrome."

Question 13 of 16

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dog eye
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How many eyelids do dogs have?

Dogs have three eyelids. The first set of two eyelids are obvious; the upper and lower lids we see opening and closing with every blink, just like humans. But the third eyelid is one we don't typically see. It's called the nictitating membrane, or haw. It is used to keep the cornea clean and protect it from injury, help produce tears, and even helps to fight infection. You might catch a glimpse of it if Fido opens his eyes slightly during sleep, and the haw is still covering the eyeball.

Question 14 of 16

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dog breeds
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The most popular dog breed in the United States is:

Far and away, the most popular breed of dog in the U.S. is the Labrador retriever. In fact, the AKC's list of most popular breeds has been topped by the faithful, friendly Lab for 23 years in a row now! The next most popular dog is the German shepherd and the third is the golden retriever.

Question 15 of 16

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dogs running through a field
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What country has the highest population of dogs?

The United States runs away with the title, with most dogs both in total and per capita with somewhere around 75 million dogs. Brazil is next runner up, and lays claim to most small dogs per capita. China is in third place. India meanwhile is poised to shake things up. It may still have one of the lowest levels of dog ownership, but between 2007 and 2012, the country saw a 58% rise in number of dogs!

Question 16 of 16

Score: 0

dogs barking
What breed is the "barkless dog"?

Originating as a hunting dog from Central Africa, where quiet and stealth pay off, the Basenji is the only breed of dog that doesn't bark. It is known as the "barkless dog." However, that doesn't mean they're always silent. When highly excited they will produce an odd yodel-like sound, called a "barroo."

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