[Carina43]

I don't think it matters what the reason for aggressive behaviour, if it is a: unwarranted and/or b: directed towards a member of the household, it is not acceptable. With certain puppies & dogs, whether it is learned, reinforced, or innate, the owner is not doing a proper job if the dog is lashing out at people without reason.

I have a fear aggressive dog (not a Rottweiler). I have never figured out a way to ease her stress & fear in certain situations. She was adult when I found her ten years ago, and seriously considered having her euthanised because of it. I didn't, and have never had an incident or bite with her because I recognised this and there are certain situations I just NEVER put her in. Unwarranted aggression is never a good thing, but such a dog can be "managed." I got some great advice from a dog behaviourist. To the untrained eye, she is protective & aggressive with strangers. Actually she is scared witless, self protective & will react to her stress by biting, though she has over the years become quite sweet & mellow.

Unfortunately many people are quite tolerant of pissy dogs. It's one thing when it's a Maltese Terrier, & quite another when it is a large powerful dog like a Rottweiler. One thing that many people don't realise about their "aggressive, protective, macho" dog is that it usually stems from fear & lack of confidence (like the cowardly schoolyard bully), & likely that dog will turn & run if presented with a serious challenge.

In short...in my opinion....most aggression is actually fear & lack of confidence.

Disclaimer: I am not a "canine professional." :) I've just owned many dogs & fostered/rescued lots.