I also had gotten my first 2 yorkies (siblings) at 7 weeks, which I later found out was too young for a toy dog to be taken from its mom. When I got them they were 1 pound 2 ounce each, and it took about a month before they started to gain some weight, Probably because they play so much. They are now 5 and the male (Mickey) is 8 pound 9 ounce, and the female (Minnie) is only 5 pound 4 ounce. They were the ones that started me on yorkies, and showing. They are strickly pets, and have been spayed and neutered, but are wonderful furkids.
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my yorkie was 1 1/2lbs when we got her at 7 weeks old. She is will be 9 weeks old this sunday Jan.26th. She seems to eat good ,about 3-4 small meals a day. I feed her Iams puppy lamb and rice and Iams puppy dry food. Should she have gained weight by now? or is this normal for such a small dog.She also gets plenty of rest as we have no children or other animals but we also make sure we play with her as often as we can which seems to be plenty.
There are some really tiny Yorkies out there. My friend in Hawaii has three, two of whom are fully grown and weigh less than 3 lbs. They are tiny but perfectly formed, so it may be that your little one is going to be a "tiny" too. There are some great fresh food recipes on this website, although I know that IAMS is a good brand, I prefer to feed fresh food. That way you get no preservatives or artificial colours. Keep up the good work and I wouldn't worry too much if she is eating well and keeping happy and her stool is normal.