Do yorkie bichon shih tzus see in black and white or in colour?

No. All dogs only see in black, grey and white. Just like the old movies. Hope this helps!

Actually, they see color, but their chromatic acuity is significantly less than humans'. This is for two reasons: (1) dogs have far fewer cone cells in their retina (cone cells are responsible for seeing color); and (2) dogs are dichromatic (the see only two primary colors - blue and yellow)