The most highlighting difference between the two is their coat color. The Yorkie's coat combines two colors like black and tan, blue and tan, blue and gold, or black and gold. On the other hand, the Biewer terrier's coat has three shades, like black, tan, and white; blue tan and white; chocolate tan and white. Also, the Yorkies have docked tails as mentioned in the breed standards, while the Biewers lack docked tails.