Let me be clear I have no expertise in lgds. But for a 5 acre piece of land is it necessary to have such a large dog. I would think if your only really dealing with predators up to coyotes and stray dogs my vote goes with Doberman pinchers. I have 2 and 5 acres they can cross in about 25 seconds. When they get there they are all business. Not really a " livestock guardian" breed by definition but are easy to train, super loyal, easy to care for, and would work for a small place like that. Not sure where your at but only downside is super cold climates might not be best. Good ones are easy to find and priced accordingly. My female was straight from Europe excellent lineage but you can get them cheaper, any where for $500-$700. I know you will think it's stupid to think of them as a livestock guardian but mine will even herd cattle.