Dog Models working for free?

Dog.  Spelled backwards - GOD.  Coincidence? Almost completely blind due to glaucoma and cataracts, Lady Byrd, our red Mini-Pin, knows her name.  She makes for an excellent model for me when I am working on black and white, shades, hues and light.  It's as though she realizes that for a moment of her busy day, a treat is sure to follow.