Rin is just a little under the 4lb mark (6 years) and she came from an otherwise "standard" litter. 7lb mom and 6lb dad....she just happened to be the smallest....
Rin has always been the smartest, most playful and robust little girl, plus she is very "emotionally stable" and independent. No separation anxiety or nervousness at all.
She is positively wonderful and generally healthy. However, she does have Grade 1 LP so we have to be careful with the jumping. This is difficult because she has no fear and loves to play chase. Also, the dental issues have already been fairly significant. Poor thing needs a cleaning every year and has already had several teeth pulled. My vet tells me this is common for tiny yorkies. Unfortunately, i was unable to train Rin to a toothbrush. So my advice: BE PREPARED TO BRUSH TEETH

