[TrishB]

I would like to say that environment over-rules all. However, it's the type of environment that you have to watch out for.

A dog with a predisposition to aggression, may do quite well with an experienced, dedicated dog owner who utilizes all of the resources at their disposal (Kennel Clubs, Veterinarians, Obedience Training, etc.).

Sadly, the vast majority of homes are NOT like this.

There is also no way of evaluating the degree of the predisposition. The public at large is not interested in such things and assumes that their dog will be even tempered.

So whereas Nurture CAN over-ride Nature, it is highly subjective and dependant on many factors.

The best we can do is to research all we can about our respective breed - know their potential, both good and bad and be ready for the extremes of each. Never be ashamed to ask for help, and always listen.