This is a weight chart we found on the web. It has been very accurate. It follows the rule of the Thumb very well as to 3 times the weight at 8 weeks and double the weight at 12 weeks Yorkies, will weigh less than this chart, because they stop growing sooner. Yorkies will double their weight at 10 weeks of age. add 3 oz. This scale should hold true if you don't feed food off the table, unless it's meat and vegetables. There are things a Toy breed dogs shouldn't eat.