anything 10lbs and under is still a very small dog. NO BREEDER CAN DETERMINE AN ADULT SIZE. if they say they can, they are not being honest. there are many teapots (over 10lbs) here on yt.
just love your little honey and give her the best of care. i would let the breeder know how displeased you are and even write a letter. maybe this way she may stop her practice of telling people adult size when it cannot be determined.
__________________  lisa lisa and the cult jam yorkies |