The only sweat glands a dog has are between the paw pads.

The tallest dog living is ‘Giant George’ a Great Dane, who measured 1.092 m (43 in) tall on 15 February 2010 and lives in Arizona, USA.

A female carries her young about 60 days before the puppies are born

The smallest dog in terms of length is Heaven Sent Brandy, a female chihuahua who measured 15.2 cm (6 in) from the nose to the tip of the tail.

A one-year-old dog is physically as mature as a 15 year-old human.

The world record for the highest jump cleared by a dog is 172.7 cm (68 in), achieved by Cinderella May a Holly Grey at the Purina Incredible Dog Challenge National Finals.

Dogs have twice as many muscles for moving their ears as people.

A dog's nose is not just used for smelling, but also to keep him cool. That's why a dog pants. The longer the dog's nose, the better his cooling system works.

The fastest time a dog has unwound a non-electric car window is 11.34 seconds and was achieved by Striker, a border collie.

A puppy's eyes do not open until it is 10 to 15 days old. Its vision is usually not complete until it is about four weeks old.

The world record for the most tennis balls held in the mouth by a dog at one time is five. Augie, a golden retriever successfully gathered and held all five regulation-sized tennis balls on July 6, 2003.

People have been keeping dogs as pets for the past 12,000 years.

The longest ears on a dog measured 34.9 cm (13.75 in) and 34.2 cm (13.5 in) for the right and left ears, respectively. They belong to Tigger, a bloodhound, who lives in Illinois, USA.

Sadly, statistics indicate that eight million pets lose their lives in animal shelters each year due to overpopulation.

Dogs can see color but it is not as vivid a color scheme as we see. It is much like our vision at twilight.