To measure her girth I use a piece of string and wrap it around the biggest part of Lily's chest, just behind her front legs. Then I measure from the base of the neck to the base of the tail for her length. Finally, I measure around her neck (I always add an inch or so to allow for her ears). I hope that helps.
I measure by weight xxs under 4 pounds 4to6 pounds xsmall 6to 8 pounds is small .When i got my first chi i ran out and got a bunch of xxs and xs clothes none the less he turned out to be allmost 8 pounds he is now 7 months old. So dont go crazy until they are one and stop growing. :wave: :wave: