Dog Health Questions: Watch dog training?

Okay so i want to train my dog to be a watchdog but without making her aggressive towards anyone unthreatening and maybe myself. Is there web sites that I could maybe go to to read up on, or whatever? She's an australian cattle dog mix I think. I'm pretty good with handling dogs but needed some professional advice on this. Anything anyone can give me will be helpful.

Dog Training - How to Train Your Dog to Come to You & Prevent Dangerous Situations

Recommended Answer:
Ooh a queensland. Those are pretty loyal and protective dogs. If you don't want her to be aggressive just teach her to bark a couple of times to warn you if anyone is coming. This shouldn't lead to aggression. Those are good dogs for that purpose. Hope this helps!

Dog Training - Secrets For Training Your Dog

• Hello...you want a PRO go to a PRO site for training, many claim to be Pro's in here..but then anyone can be anything they want on the net & most usually are ... a good < key word;) pro would not be in Yahoo Answers claiming professionalism, even if they are !! Take Care :) P.S Police dog training happens in Germany, the dog & the cop take classes !!