When I was a kid we had one of those huge poodles. Loved that dog.  One day my brother and I came home from school and for some reason the dog attacked him and bit him pretty good on the arm.  The Vet told us that we had to get rid of him. It made no sense because you could tell the dog knew what he had done.  The Vet said the unfortunate thing is, if he bit him one time, he will do it again. That is their nature.