I do not agree Pit Bulls are NOT good guard dogs. They may be intimidating and possibly deter an intruder but they are bred to be very people friendly to all and not to be leery of strangers which is pretty much the opposite of what guard dogs are bred to be like.
I'm not saying one wouldn't protect his owner if need be but that is not what they are best at doing and the other breeds listed are specifically bred for those purposes and better suited for that specific task
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What type of guarding are you looking for? Do you want a dog to just be outside patrolling a yard that can look intimidating, or do you want a dog that can be protection trained? Please be a bit more specific....
I have American Bulldogs and do bull breed rescue. The breed itself is a bit aloof to strangers and will bark, etc. at intruders, but any dog will need to have strong nerve and be trained to truly take action. I should also mention that many types of dogs will alarm bark, and in most cases that will deter would be intruders.
Definately a Chihuahua. I have been chased down and bitten by them little suckers. They can be protective little coots. I think they are actually big dogs in little bodies. They can shred a pantleg in seconds , if their ferocious barking doesnt scare you off first ! lol
If you are a dog and your owner suggests that you wear a sweater, suggest that he wear a tail.
Dogster, I don't like to stereotype any breed as a 'guard' dog, persay, because although people have the perception that the Rottweiler,German Shepherd, Pitbull, etc. are the obvious choices, it's been my personal experience that some of the smaller breeds can be very territorial, and not about to let a stranger in the house. I've been bitten twice in my life, once by a poodle, and the second time was a blue heeler. I owned 2 Rottweilers for 11 years, and although the looks of them scared the crap out of everyone, they would'nt hurt a flea. I now breed Bostons, and two of them won't allow strangers in the house. So it really depends on your circumstances, how much room you have, where you live, how old your children are, how much time you have to devote to the dog, and the reason you require a 'guard' dog.
My rottie was definitely not a "guard" dog--she was a big ole softie, which I loved dearly. She was probably more bark than anything.
Dusty your comment made me smile :) Pebbles will bark...from a distance. She's a little chicken. I guess I've been blessed enough to have dogs that'll alert me & give me enough time to protect myself :)