[Quadraphinic]

My Dad had 3 dogs, none of them were Yorkies, but he taught them where their bowls went, and only let them eat from their own bowl. He said it took a couple of weeks for one of the dogs to get it, but Angel finally did. He put the bowls a couple of feet away from each other, and always in the same spot, he also stayed with them for the 1st month during meal time. If that doesn't work, try feeding them one at a time or in separate rooms. Good luck, and I hope this helps.
Cheers Quad