The only dog I've ever seen do a "death attack" was a Jack Russell..
Our Jack Russell went alpha on one of our shih tzus a while back... and literally sunk his teeth into the throat of the shih tzu.. and was trying to rip out his throat. The shih tzu spent the night in the ER...
Then when I pulled them apart.. the Jack Russell attacked me... taking out a half inch literal chunk of flesh from just above my elbow...
We started researching... and Jack Russells are terribly territorial... and there are lots of stories of Jack Russells killing house cats randomly... and things like that when their balls drop and they get all "alpha"...
We gave him to the ASPCA with a $100 donation... Told them he was extremely alpha.. and had attacked... They were going to put him under.. but the Vet at the ASPCA fell in love with him.. He's now a single household dog... who gets to go running in the park all the time..
So environment plays a huge part in a dog's actions.
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