Three eyelids in the eye.
Every dog has three eyelids: top, bottom and side - it is hidden in the inner corner of eye. The third eyelid can go out of the corner and dissolve in the eye in order to clear the ocular surface.

All dogs have 42 teeth.
Six pairs of sharp incisor teeth in front. Two pairs of large tusks. Other teeth - premolars and molars. The incisors and tusks are especially important: with them help the dog can bite and tear his food.

Biggest appetite.
The biggest appetite among all breeds of dogs belongs to the Cocker Spaniels.

What dog have a tongue for.
Tongue is directing food into the throat, is used to lick the wool and to regulate the temperature. If there is an overheating of the body dog sticks out his tongue and cools. Dogs can sweat through the pads of their paws, through the skin there is only a little sweat coming.

Dog can distinguish up to 500 000 smells.
Sense of smell is very well developed in dogs. The dog constantly sniffs the air, ground and surrounding objects in order to navigate in the world. Olfactory brain center is located on the forehead just above the dog's eyes. It is known that in general a dog distinguishes between half a million smells, while the man - only a few thousand.

How dogs can hear.
It is proved by science that dogs can hear sounds of frequencies up to 35 kHz. For comparison: the upper limit of human hearing - 20 kHz.

Man and dog share many common things.
Man and dog have the structure of their genes for 97% the same. Maybe that is a real reason of our good attitude to the "four-legged friends"?

What does a dog's barking means.
After parting with the owner, the dogs go for a short bark and a higher tone. When the doorbell is ringing, the dog will react with the loud and sharp barking, at times going to the sprawling "super-bark". While playing the dog will bark with a rugged, high voice.

No for killing a prey!
Properly trained Arabian Hounds will never kill their hunting prey, but only bite the ligament on it's hind legs. This is done to ensure that the meat will not be spoiled in the heat.

Dog's span of life.
Usually dogs of small or medium sizes are living for up to 15-18 years. Large dogs live for around 10 years. Sexual maturity occurs at the age of 10 months, the smaller is the breed, the earlier is the dog maturing.

Dogs are not very careful.
Zoologists conducted an experiment whose purpose was to determine the degree of caution of the pets before crossing the road. It was found that the most careful is a goose, he almost never dies under the wheels of cars. At the second place for being cautious was a pig. It is followed by a cat, chicken and finally - a dog.

Green Puppy.
In America there was born a green puppy, which gradually turned pale and eventually became white as his littermates.

Dogs are laughing.
Laughter of the best man's friends sounds like a kind of recurring snort: when the other dogs hear it, even recorded on a tape, they begin to wag their tails and play.

Every fourth dog in England is suffering from stress.
Canine stresses are similar to those their owners suffer from. The experience of stress in every third animal is manifested in the form of severe gastric disorders.

In India there was established a dating service for dogs.
Local animal lovers have created for their pets a dating service. The website contains photos and descriptions of those dogs who have not yet managed to find a match. The owner can choose a partner that by his opinion fits his favorite pet, and arrange for them a meeting. This initiative became very popular. With this service hundreds of animals have found their perfect mates.

Purebred dogs look very similar with their owners.
Psychologists separately photographed 45 dogs and their owners, and then asked that the 28 judges compared people with their dogs. They guessed the correct relationship in 16 of 25 cases. Since the appearance of an adult purebred dogs can be predicted at birth, the researchers concluded that the owners tended to subconsciously choose dogs that are in some way similar to them by looks.

It is possible to identify the breed of dog by the genes.
You can identify the smallest genetic differences among dogs of different breeds. There were studied the genetic sequences from 414 dogs belonging to 85 different breeds and clearly defined features of the codes which can identify breed of dog, without actually seeing an animal itself, but by only looking at the genes.This all is even more surprising because the majority of the dog's breeds have been identified and isolated only in the XIX century with the establishing of kennel clubs.