Do dogs see in black and white?
No. Dogs see colours, but fewer than people: they have two kinds of cones instead of three. They tell blues and yellows apart well, but mix up red, orange and green, which they see as yellowish or greyish tones. That’s why a red ball on the grass is so hard for them to find.
How does the simulation work?
Each animal has a different mix of colour-sensing cells and a different sharpness. The tool changes the colours of your photo based on that and adds each species’ typical blur. It’s an approximation: nobody can see exactly what another animal sees, and some, like bees and birds, see ultraviolet light that a screen can’t show.