Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 6 months ago

Bismihi ta'ala

You would be allowed to have a shepherd dog or a guard dog, and it will be very useful to do so. Keep in mind that a dog is still externally najis, and you must still treat it as such. For example, if the dog is wet, and it touches you, or you touch it, or it licks you, or its hair gets onto you, etc, then you will need to purify yourself. 

It would also be important for you not to allow the dog inside your house, or in areas you need to keep tahir, and so on. 

And Allah knows best.