Hardheaded!
One man's dog!
My buddy that parks his travel trailer next to mine at the Duck Club has one. I have been violated numerous times!

Especially every time I bend over to light my hot water heater! He aims for any available orifice and every time I run away he bites me in the ass!

No joke!
He's the only dog in the world that Jack looks at and actually wants to fight. If you knew Jack you would be surprised! I've known 2 other Chessy's to be the same way but they love their owners and family.
Like skeet said, be ready for some tough training unless your experienced.