Bulldog,  also known as the British Bulldog or English Bulldog, is a medium-sized dog breed. It is a muscular, hefty dog with a wrinkled face and a distinctive pushed-in nose. The Kennel Club (UK), the American Kennel Club (US), and the United Kennel Club (US) oversee breeding records. Bulldogs are recognized as excellent family pets because of their tendency to form strong bonds with children. Most have a friendly, patient, but stubborn nature. Bulldogs are recognized as excellent family pets because of their tendency to form strong bonds with children. Generally, Bulldogs are known for getting along well with children, other dogs, and other pets. Like all brachycephalic dogs, bully breeds often suffer from brachycephalic airway obstructive syndrome. The condition manifests in a variety of ways, often in the form of intolerance to heat and physical exertion. Bulldogs have very small nasal cavities and this makes them have great difficulty keeping their bodies cool.