I've known plenty of dogs that have been neutered and were still aggressive. In part of the study, it actually listed aggressiveness as a side-effect of neutering. Amazing what the "rescue world" has used as excuses to get everyone and their brother to fall in line with making less healthy pets.
Be totally aware, I'm all for people that aren't going to be responsible pet owners to have their animals fixed. It's just stupid to let intact animals run around hither and yon impregnating and getting pregnant at the drop of the hat with anything that smells good. But we're responsible owners. We have absolutely no intention of letting these 2 brats breed--purebred or not. A leash and a fence with continual supervision outdoors works just fine for birth control.
We refuse to be pressured into neutering anymore animals. All we've gotten with 3 that were neutered were health problems that could, probably, have been prevented if we'd not been pressured into every vaccine known to mankind, neutering, and processed foods. And I think that people should think about the new health information that continues to come out about these issues. Maybe it would make some start to become more responsible owners if they did.
Concerning their behavior from the study:
https://drive.google.com/file/d/0B4rev6uIW8FiOWN4d3Z1LVAyNWM/view?pref=2&pli=1 Behavior and Cognition
The role of gonadectomy on behavior is complex
and evidence for benefits as well as detriments following
gonadectomy has been reported. Reproductive-related
behaviors (such as urine marking in house, mounting, and
roaming) are all reduced or eliminated following
gonadectomy [83, 84, 30].However, fear and aggression
tend to be exacerbated [85]. Fear of storms, fear of gunfire, fear of noises, fear
biting, timidity, separation anxiety, and submissive urination
all increase significantly following gonadectomy.
Gonadectomized females are also more reactive to the
presence of unfamiliar humans and dogs [86]. Although
some dogs may become less aggressive following
gonadectomy [84], dominance aggression [87]and owner-
directed aggression [21, 88] occur with a significantly
higher frequency in gonadectomized dogs compared to
unaltered dogs. The hippocampus and hypothalamus both
play important roles in controlling behaviors, especially
those pertaining to fear and aggression. Luteinizing hormone
receptors are abundant in hippocampus and hypothalamus
[89-91]. In addition, administration of supraphysiologic
concentrations of LH to gonadectomized animals can induce
aggression and other behavioral changes [92-94].
Cognitive dysfunction syndrome is a
neurodegenerative disorder of senior dogs, which is
characterized by both cognitive changes and
neurophysiological pathologies [95, 96]. Memory
impairment, poor problem solving skills, social disconnect,
confusion, and day-night reversal may occur as the
condition progresses. Gonadectomy significantly increases
the development and progression of cognitive dysfunction
syndrome in dogs. Increases in luteinizing hormone are
associated with declines in cognitive performance [97]. In
addition, elevated LH concentrations increase beta amyloid
plaque formation and are implicated in the development of
Alzheimer’s syndrome in humans [98, 99]. Male sex
hormones and systemic inflammation in Beta amyloid
plaques are also involved in the pathogenesis of cognitive
dysfunction syndrome in dogs [100, 51]. Therefore, it is
possible that LH and its receptor are important in the
development of cognitive dysfunction syndrome in
gonadectomized dogs.