Betsy's Finding About Shitty Dogs

To be specific, my niece Betsy has a well founded hypothesis about Chihuahuas and the in home abuse of children. Betsy works in social services and is called upon, among other duties, to remove kids from homes in which they are abused.
Chihuahuas as we all know, or should know, are a species with no redeeming qualities at all. They demean all other dogs, many of which are noble and helpful. Even mosquitoes are more elevated than these useless dog-rats. To kick them, all one needs to do is show them one's hand and when they leap up to bite it (even if its the hand that feeds them) they can be kicked judiciously in mid air. The extinction of this species would be a welcome development. Check out stories about people kicking these despicable creatures by Googling "man kicks Chihuahua".
But I digress.
Betsy's finding, after some years of careful observation, is that whenever a kid needs to be extracted from an abusive household that includes a dog, that dog is a Chihuahua. Not sometimes; not frequently, but always. If there is a dog in the house along with an abused child, it will be a Chihuahua.
Why is this? Do people take out their anger at their crappy dogs on their kids? Is there some toxic component in their saliva or fur that drives people crazy? Or perhaps child abuse and shitty dog ownership are somehow linked in some cause and effect relationship?
Well worth some extensive research if you ask me.