These are the most common inherited illnesses in Miniature Bull Terriers. Miniature Bull Terriers can inherit other illnesses beyond these, but these are the most prevalent. If you are thinking of breeding Miniature Bull Terriers, please speak with your veterinarian about potential tests that should be done to avoid congenitalCongenital means present at birth. Something that is congenital may or may not be inherited by parents and passed on to offspring. disorders in offspring.