Bull Terrier, silly as a wheel for a couple of years and don't need to be trained, mine would let anyone in as long as we were home but he'd rip your arm off if you came near or jumped in the back yard.......that was HIS place.
Mind you I was up at Leinster when I got him and at about 4 months old he tried to take on a truck loaded with about 50 coons & their dogs.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.