Can upbringing/puppyhood effect the behavior and personality of a dog? Why are 100,000 dogs killed in Spain each year?

Are behavioral issues unique to geographical locations? level of abuse? lifestyle during puppyhood? How do these effect the personality or needs of a dog? Perhaps all of these have an effect, but what is most important are the way the dog thinks and processes based on experiences, which are not as unique to geographical location and/or breed as one may think. How a dog is forced to think and how he perceives his surroundings effects his behaviours. Sound obvious? ...