Although, the dog could tell the difference between the swords. Dogs are blind to red which means pure red things are like an absence of any colour, so red would appear black. Dogs can see blue and yellow which combine to form green which to them would be all of the colours, and so it would appear white. I'm sure an anthropomorphic dog would understand that when humans say "green" they mean "white" and when humans say "red" they mean "black".
Not quite; there’s people with red-green colorblindness too. Just put a picture into Photoshop and restrict the color spectrum to the green-blue range for a general idea
Sure, it wouldn't be black. If it was a pure red (absolutely no other colours, just pure 100% red) then it wouldn't have a colour to a dog. It would have a shade, and it certainly wouldn't be absolutely pitch black but close enough. If, however, it's not a pure red then it would appear yellow or blue as in the picture you posted.
No, because the dog would know that if someone says "red" they probably mean "black" or some shade of black, and "green" would mean "white" or some shade of white.
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