Has she had a sudden loss in appetite or weight loss at all - or has she always been on the 'slim' side? A sudden weight loss or loss of appetite might be a cause for concern, but so long as she is playful and happy as you say, she sounds ok.
A good way to judge if your puppy is too lean - feel for her ribs. If you can REALLY feel them under the skin (and think you could probably see them if she had no hair) then she is underweight. On the flip side of that, if you CAN'T feel them AT ALL, then she would be considered overweight. You should be able to just slightly feel the ribs under the skin, but only slightly - this is how I keep an eye on my pup's weight. I do the rib test fairly regularly... and I've gotten pretty good at estimating their weights based on this. Yorkies are pretty lean dogs - I've seen some stockier yorkies with beautiful builds but I think this also depends on the amount of muscle mass they have.
If you do feel that she is underweight, you could try leaving her food out for her all day (assuming that she's on a kibble diet - and if you're certain she will not 'gorge' herself). |