Bulldog
The Bulldog, colloquially known as the British Bulldog or English Bulldog, is a medium-size breed of dog that originated in England.

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Appearance
Purebred 6 month-old puppy from AKC Champion bloodlines
The Bulldog comes in a variety of colours and ideally has a smooth, short coat. The only disqualifier for the breed in the show ring is a liver colored nose, although black-coated bulldogs are not preferred. In the US, the size of a typical mature male is about 50 pounds; that for mature females is about 40 pounds. In the United Kingdom, the breed standard is 55 pounds for a male and 50 pounds for a female, but it is not uncommon for males to be 70 pounds
Temperament

Despite their famous "sourmug" expression, bulldogs are generally docile, friendly and gregarious but occasionally willful. Breeders have worked to breed aggression out of the breed, and as such the dog is known to be of generally good temperament. Bulldogs can be so attached to home and family that they will not venture out of the yard without a human companion. Due

A bulldog is suitable for houses as well as apartments due to their size and susceptibility to the weather. They are easily trainable as compared with many other breeds.
Health
A bulldog's skull - notice the characteristic underbite (technically called mandibular prognathism)

The bulldog's appearance attributes to specific health issues. Breathing issues can be prevalent in the breed due to the shape and the shortness of muzzle, which was originally bred for gripping. In particular, bulldogs are known to snore. In the United Kingdom, some dogs can be prone to interstitial cysts, which are cysts which form between the toes. These cause the dog some discomfort, though they are treatable either by vet or an experienced owner. Other problems can include cherry eye, certain allergies, and amongst older bulldogs hip issues. Bulldogs have extremely strong jaws and are capable of suspending themselves off the ground for over an hour by their vice like grip.
Because of the large heads in proportion to body size, puppies are frequently delivered by Caesarean section as they can get stuck in the birth canal during natural birth. However, it is not uncommon for a bulldog to whelp naturally and successfully.

Like all dogs, bulldogs require daily exercise. If not properly exercised the bulldog could gain weight, which could cause health problems relating to the lungs and heart. Bulldogs are extremely sensitive to heat and cold and great care should be given to the dog during overly warm periods. During these times, the owner should ensure that the dog has plenty of shade and water, and should be ideally kept out of standing heat.
As the breed has developed, the tail in some dogs can be tight to the body and can cause infection if not treated or cleaned underneath regularly.
History
The term "bulldog" was first used around 1568 and might have been applied to various ancestors of modern bulldog breeds. Bulldogs were bred in England as a cross between the mastiff and the pug.
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Article:http://en.wikipedia.org/
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