A panting dog can take about 10 times as many breaths in the same time period as a regular dog. This cools them off on hot days.

While dogs curling up when they sleep might look cute, there are some good reasons for it. When dogs were wild, it kept them warmer while they were outside, and also protected them from sneak attacks.

Chows have a very distinctive blue-black tongue, They are born with a pink tongue like most dogs, but it starts to change color when they are 8 to 10 weeks old.

A dog's ears are extremely expressive and it's no surprise. Dogs have around a dozen different muscles that control their ears.

It isn't even close when it comes to comparing the sense of smell of humans to that of dogs. Dogs sense of smell is 10,000 to 100,000 times better.

While a group of dogs is called a pack, groups of breeds sometimes have different names.. Pugs are called a grumble. How adorable is that?

Border Collies and the Poodles are considered to be the most intelligent dogs. While the least intelligent is thought to be the Afghan Hound.

Dogs usually understand 150 to 200 words They can also understand an entire series of hand movements. Don't underestimate your dog's smarts!

There have been studies shown that men approaching women have much better success if they have a dog with them. The dog that does the best in this situation is the Golden Retriever.

It has been found that petting a dog actually lowers a person's blood pressure. Dogs have long been used as therapy animals because they are known to help people relax and feel better about themselves and their situation.

Labrador Retrievers are enormously popular in the United States. They are also the most popular dogs in Canada and Great Britain. We can see why. They are awesome dogs!

The Greyhound is super fast. Some of them can go up to 45 miles an hour. In some states they are even raced.

Dogs are pack animals, which is one reason they are so loyal to humans as they look at us as the alpha. Dogs are more likely to chase or hunt when they are in a pack than when they are solo.

The dog that played Toto got $125 a week for filming, while each actor who played a munchkin only got $50.

Not everyone knows it but Scooby Doo was a Great Dane. While Danes are enormous and can be scary to people whodon't know dogs, they are actually super sweet.

Dogs are incredibly popular. While there are 400 million dogs, there are more than 7 billion people, so what are you waiting for? Go to your shelter and adopt a dog.

Guide dogs are trained while​ they are between 15 and 17 months of age and get extensive training before being matched with a human. It is impossible to watch a guide dog work with someone without being impressed.

Lassie was a world-famous collie who starred in the movies and on television in the '40s and '50s. The first Lassie movie was "Lassie Come Home."

A Corgi is a very popular dog. They are adorable and smart, but they are very small, hence the name "dwarf dog."

Although dogs are now domesticated, they are still wild animals at heart. Hence their love of smelly things.

If you have to crate your dog for any reason, put a worn item of your clothes in with him. The smell will help the dog relax, thinking it is not far from home, and that you will be returning soon.

The Basenji is the only dog that doesn't bark, but it does make an odd yodel sound. They are also known as the "African Barkless Dog."

Rin Tin Tin was a German Shepherd that was a huge movie star in the '20s. He was rescued from a WWI battlefield by an American soldier and trained by him.

The oldest dog ever was an Australian Cattle Dog named Bluey. He lived to be 29 years old, according to the Guinness Book of World Records.

Dogs are mentioned 14 times in the Bible, while cats aren't mentioned at all. Hey, cat lovers, don't blame us. We didn't write the Bible!

A researcher named Stanley Coren says small dogs have more dreams than big dogs, but big dogs have dreams that last longer. We can only imagine what they dream about.

If you ever see dogs play with each other, one is often the chaser and the other is the runner. To play hide and seek with a person fits right in.

While big dogs are cool, smaller dogs tend to live longer. A Great Dane might make it to 12 if you're lucky, while a dog under 20 pounds could live much longer.

While most dogs are just pets, there are many dogs that are trained to hunt. They can be used to flush out prey, retrieve prey, or trap and corner prey.

Dog movies have long been popular with children and adults alike. Of all the dog movies out there, "Lady and the Tramp" might be the most well-loved.

While the Great Dane, the Irish Wolfhound, and the Bull Mastiff can all weigh more than 150 or even 200 pounds, the Pug usually weighs in around 20 pounds.

While other dogs are sometimes used as police dogs, the German Shepherd is by far the most popular. They are smart, athletic, fearless and enthusiastic.

The smaller the breed, the smaller the size of litters they tend to have. That makes sense when you think about it.

Dogs are direct descendants of wolves. Occasionally, someone keeps a wolf for a pet, although that doesn't always turn out that great. When left to their own devices, a pack of dogs acts very similarly to those in the wild.

While everyone wants to pick an original name for their dog, that doesn't always work out. Max and Jake are the two most popular for male dogs, and Maggie and Molly are the most popular for females.