Well first to correct you, horses do not have "lips" in a literal meaning. They have muzzles like dogs and cats. So the outter colour of a horses' muzzle has to do with their color. Some have white, chestnut, brown, black, ginger, or spotted. But, the inner of their mouth is the pink color of the inside of our mouthes. Hope this helps.
A horses lips are almost always the color of its skin with a slightly darker shade inside the mouth.
No
Most women have red as the color of their lips. Lips do however, come in many different shades of red or pink.
cause he has lips like a horse. and horses love sugar
He is drawn without lips.
Cleoparta colored her lips with crushed ants.
Justin Bieber's lips are pink.
black?
Your lips can definitely change color because of smoking. This is because smoking restricts your lungs and therefore can give you poor circulation leading to blueish lips.
Because it is the company's logo the color is to match the shirt's color! There is a difference between brown horses and blue horses, but I do not know why.
Natural...?
red
Red