Even when American Bulldog there besides the deafness, with only one testicle, CMR1 (Canine Multifokale Retinopathie) and entropion (eye diseases) even more so-called hereditary diseases. Therefore, it is extremely important that the parents of the desired puppies are evaluated and you therefore risk a sick dog to buy, already reduced by a significant degree.
Of course, these health tests cost money, which the breeder has to invest. Therefore it is a logical consequence that "cheap puppies" usually neither pedigree do nor have health evaluations of the parents present !!!