[https://blog.dogsbite.org/page/2
pictures and more details at link, including the two deaths by pit bull maulings this week.]
I have read that (paraphrased) “What a dog looks like, it will act like”. By veterinarians. In addition, I have read that the breeders who attempt to domesticate foxes as pets have found that the ones who become the most suitable for pets rather than wild animals, are the ones who begin to look like domestic dog breeds e.g. floppy ears. Sources probably www.animals247.org and youtube domestic foxes, particularly Russian breeders, I think.
Found one of them. Caveat: The Animals 24-7 website is not conservative in the slightest. The research and statistics are excellent.
Excerpted from link below:
“Pit bull appearance linked to brain structure––and behavior
In simplest terms, if a dog has the blocky head shape and oversized jaws characteristic of a pit bull, a magnetic resonance imaging scan is likely to identify the brain structures associated with sudden, random, unpredictable violence and “dead game” fighting behavior as well.
Co-authors, along with Hecht, of “Significant neuroanatomical variation among domestic dog breeds” include Stony Brook University anthropologist Jeroen B. Smaers, Ph.D.; William J. Dunn of the Michigan State University Department of Psychology & Neuroscience; University of Georgia at Athens professor of neurology and neurosurgery Marc Kent; and Emory University neuroscientists Todd M. Preuss, Ph.D. and David A. Gutman, M.D.. . .” . .
It is well worth reading. Also please ggl author Semyonova (sic) dog behaviorist scientist, possible PhD.