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We had a neighbor caring for two mentally and phisically handicapped adults. Jack sensed their weakness and it brought out his killer mode. I had to be VERY careful with him.
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We've had a number of Rotts and they all seemed to have this trait. Fine dogs and great companions but you always had to be EXTRA careful with them. They could be good for years and then something can set them off and that aggressive instinct comes out. Usually over weakness or fear someone displays.
As much as we loved rotts, we just could never fully relax when we had one. You just never knew when that one time would come up. We've switched to labs and have been very happy with our choice.
