Enjoyed learning from you, Bear.
Good thread.
Good thread.
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Mmmmmmm....Greyhounds love cats! But they're hungry again in about an hour.

That's a really good question. I think it can be caused by a variety of things. Behavior of the owner, behavior of the suspicious person, but most commonly I thnk they are just spooked because of the different skin color. Kind of like why some dogs bark at people wearing a hat.
Mine are aggressive to beards and hoods(on jackets), not sure why.
I have a Lab (a friendly one), but what I have taken from this thread is everyone (excepting those that clarified) owns a bad-ass attack dog, even if they were not trained. Cool.
My springer will drown you with drool, or may sit on you until the cats attack.

It's not the dog that bites at my house, it's the XD.