basically you just need to get any large dog, and let it learn from your other dogs how to guard properly

i have to other stuff to think about too
i need a dog that can survive cold winters hot summers
etc etc

depends how the rottweiler or german shepherd has been brought up - they can be good guard dogs
pitbulls are not really a guarddog breed



pyrenees (and their forerunners) have over centuries defended sheep flocks against wolves etc so it's clearly a good choice for protection against wild animals



not the ideal weather for pyrenees but your current one seems to cope well

but you could consider a neapolitan mastiff

my pyrenees is pure white, i shave him almost bald once a year

and those are expensive

Belgian Malinois
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my neighbor has two of these and they dont care if a bull came on their land, they would kill it instantly.
be prepard to fork out some dough for these pups and their a handfull to train.

My german shepard would take anyones head off that walked through my backyard also.

if you want one for cheap money, go to the shelter nearest you and see what they got. you give a sheltered german love and compassion, they would risk their life for you no matter what

most dogs would, even lap dogs
there is a difference though between breeds in the instinct to protect property

one doesn't see many belgian shepherds (any of the breeds) around, but i meet a tervuren some times on my walks
and no surprise the traits of the german shepherd is similar, belgian shepherds provided a lot of input into the creation of the german shepherd as breed

get a wolfdog

Agree with the guy who said any medium to large breed will suffice if trained correctly.

We had a German Sherpard/Husky mix, and a purebred American pitbull on the family farm (40 acres of border property in Washington State), both wonderful gaurd dogs against bears, coyotes and smugglers.

not really true
many dog breeds are quite territorial (what you want in this case) but there are breeds which are not