All you people with all this dead dog talk First of all the guy asked what's a good guard dog, ability ,size etc. Secondly dogs have been used in warfare for thousands of years, known to take an armed man, a heavily armored armed man off a galloping horse! with a fricken sword or some medieval weapon. They are used through and up to present day war in Iraq .They provide a service ,a duty that is respected . And they love to do it because its what they have been bred for thousands of years to do (serve man) .... Now most burglaries that happen are unarmed drug addicts, or rapist with knives ...The armed professional will have the upper hand but that's the exception . In that case your screwed anyway so go out fighting ,not curl in a ball and hope he passes by or submit WTF. I like to see some drug addict crack head with a knife take on my dog,he better have a gun or he's leaving in a black bag.... maybe a hamster would be a better choice for some