These four dogs are all good, trainable breeds. Unfortunately, they have all developed problems over the last few decades due to MASSIVE overbreeding. The latest "trend" in overbreeding is currently taking place with the rotts. They are quickly becoming sickly dogs, with bad attitudes and zero intelligence.
If you and your wife plan to have any children around, (in the next 10 years), I would give serious thought to investing in an alarm dog, rather than an attack dog. Go with the collie.
Also, try a setter, a lab, or a retriever. Rely on the telephone, the blade, and the alarm system for home defense.
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