I am a big fan of Lupine products. I use their Roman style harness in the 9-14" size. My dog is right at 4lb, and there is plenty of room to adjust it down smaller. It fits longer down the body than a buddy belt, so that is something to consider. They make a step-in style harness too. Best of all, they are guaranteed even if chewed, just send it back and they will replace it! They come in solid colors and many great woven patterns too!
Sent from my iPad using Tapatalk
First time Chihuahua owner with many years of dog experience!