How to Measure Your Dog: Measure from the base of the neck to the base of the tail. If unsure order the next size up.
I ordered the size 8 for my 5lb Chihuahua and it fits her very well. This is such a cute tee and she seems to enjoy wearing it. The fabric is soft and the quality is great for the price. Great purchase.
"true to size"
I purchased this item for my pointer mix who is about thirty pounds. I purchased the size 16. It fit her well. The material is very thin, but she has not ripped it yet which is great since she likes to run around in it. It was also very easy to put on, just stretchy enough.