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A 2008 University of Pennsylvania study of 6,000 dog owners who were interviewed indicated that dogs of smaller breeds were more likely to be “genetically predisposed toward aggressive behaviour”. Dachshund through the snow posterDachshunds were rated the most aggressive, with 20% having bitten strangers, as well as high rates of attacks on other dogs and their owners. The study noted that attacks by small dogs were unlikely to cause serious injuries and because of this were probably under-reported. Not all double dapples have problems with their eyes and/or ears, which may include degrees of hearing loss, full deafness, malformed ears, congenital eye defects, reduced or absent eyes, partial or full blindness, or varying degrees of both vision and hearing problems; but heightened problems can occur due to the genetic process in which two dapple genes cross, particularly in certain breeding lines. Dapple genes, which are dominant genes, are considered “dilution” genes, meaning whatever color the dog would have originally carried is lightened, or diluted, randomly; two dominant “dilution” genes can cancel each other out, or “cross”, removing all color and producing a white recessive gene, essentially a white mutation.