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Some have said you are not ready for a large breed but I disagree. You have had may specific questions and have been determined to explore all options. I admire you for doing so much research before making a choice. Anyways :) I have Bull Boxers (AB X Boxer). They are great guardians and would never attack for no reason but are standoffish and will not let a stranger pet them. They will stop anybody who tries to come in the yard. They range from around 65-100lbs. We also have chihuahuas and my Bull Boxers are very good with them. They dont try to play rough with them, just seem to be very curious of the tiny dogs. As long as you get a big dog as a puppy it should be fine with your smaller dog.