I can vouch for the protective part. My customer had one....for about 6 months and one day it decided it did not like me.I serviced the pool weekly, so the dog saw me every week. I was walking back to my truck and the dog came around the corner of the house...and its eyes told me I was dead. It attacked...it went for my left hand/forearm, but I lifted it out of the way. So it bit me about 4" to the left of my boys. It knocked me flying, but I stuck my arm back and did a flip, which is what I believe saved my life. He lunged at me again, but my flip moved me away from where he was attacking. He brushed against me and missed. The pool equipment was on a 4 foot platform(flood plain). I was able to climb on top of the filter. He tried for the next 15 min. to climb up there and kill me. The homeowner finall came out of the house and put it up
I ended up with a nasty black bruise and 4 bumps, where his fangs were located, sticking out about the size of eggs. He was not able to get hold of me...I was very lucky.He weighed 187 lbs. and I weighed 193. They finally got rid of him, because it happened again with a friend of they're sons. Good luck. Hope this helps.