Two 120 pound pit bulls? I didn’t know they were that large. The owner won’t be able to control the dogs if that attack anyone.
http://www.animals24-7.org/2015/11/10/the-science-of-how-behavior-is-inherited-in-aggressive-dogs/
Article above is an excerpt of the book by Alexandra Semyonova, “The Science of How Behavior is Inherited in Aggressive Dogs”
” . . .Kathelijne Peremans, DVM discovered this by studying two different populations of impulsively aggressive dogs. Each dog had executed one or more attacks without the classical preceding warnings, and the severity of the attacks was out of all proportion to environmental stimuli. Peremans found a significant difference in the frontal and temporal cortices of these dogs, but not in the subcortical areas, compared to normal dogs. Peremans also found significant dysfunctions of the serotonergic systems among these dogs. Serotonergic dysfunction has been widely shown in many different species to be connected to abnormal, impulsive aggression.
Peremans studied dogs of various breeds, selected purely on the basis of their behavior. Peremans was not interested in implicating any particular breed, but rather in finding the mechanism behind the behavior in any dog it occurred in. She found that all of the dogs with a history of abnormal impulsive aggression shared the same physical abnormalities in the brain. The gender of the dog made no difference. Neither did whether the dog was castrated or spayed.
Heritability of behavior
” . . .The heritability of abnormal aggression in certain breeds of dogs can no longer be denied. The bodies of these dogs have been selected to execute a killing bite more efficiently than other breeds. These dogs share physical conformation to the task of killing, including exaggerated jaw muscles, heavy necks and shoulders, and body mass that makes defense against an attack much more difficult. Among people who want dogs who can kill, these are the breeds of choice because they are physically more fit for it than other breeds.
Dogo Argentino
Behavioral conformation
But breeders also selected for behavioral conformation. To perform well, a fighting dog had to attack without provocation or warning, and to continue attacking regardless of the response of the other animal. Bull and bear-baiting dogs had to be willing to attack in the absence of the species-specific signs that normally provoke aggression, responding to the mere presence of another animals, and not stopping in response to external stimuli. The Dogues du Bordeaux used to guard extended farmlands in France, the Boerbulls used similarly in South Africa, and the fugitive slave-chasing dogs of Latin America, such as the Dogo Argentino and Fila Brasiliero, all were selected to specifically for a propensity to kill.
As they selected for performance, breeders could not know exactly which physical changes they were selecting for. But research now shows that selection for aggressive performance includes consistently selecting for very specific abnormalities in the brain. These abnormalities appear in many breeds of dog as an accident or anomaly, which breeders then attempt to breed out of the dogs. In the case of the aggressive breeds, the opposite occurred. Rather than excluding abnormally aggressive dogs from their breeding stock, breeders focused on creating lineages in which all the dogs would carry the genes causing them to reliably exhibit the desired impulsive aggressive behavior.”