All puppies should be checked for deafness, which occurs in 20.4% of pure white Bull Terriers and 1.3% of colored Bull Terriers and is difficult to notice, especially in a relatively young puppy. Many Bull Terriers have a tendency to develop skin allergies. Their personality is described as courageous, full of spirit, with a fun-loving attitude, a children-loving dog and a perfect family member. Although the breed has been a target of breed-specific legislation, a 2008 study in Germany did not find that Bull Terriers had any significant temperament difference from Golden Retrievers in overall temperament researches. At the start of the 19th century the 'bull and terrier' breeds were developed to satisfy the needs for vermin control and animal-based blood sports. The bull and terriers were based on the Old English Bulldog (now extinct) and Old English Terriers with possible other terriers.
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