I had the same question a few weeks back!
Bacca is 5 months old and measures about 13 inches....I added an additional inch because I wasn't sure where the top of the shoulder was)
If I read the chart right, this would put him in standard range but it does not really tell me how big he will grow. Compared to Timber, Bacca is a big bruiser! I can imagine him turning into a hulking 35 pounder (please, no!
Can someone help interpret the charts? Thanks much!
To find his withers: Go up from his front legs. Feel his shoulder blades? There will be a dip between them (just like with a person). That's his withers.
If you measure him every week, on the same day of the week, for a couple of weeks (or longer), you'll be able to tell about how big he'll be.

Bacca likes to push around, while Timber loved to just look cute and be a lap dog! 