have you tried changing the type of kibble your feeding your puppy ?? i have a picky eating adult and a puppy thats also 12 wks ... i went to the local animal feed store they have tons of different sample bags of hard kibble from name brands..also i've found a link on here that shows what not to feed yorkies .. i'll try and find it ..i remember it was posted by the admin of YT..my breeder highly recomends Royal Canine food btw ....also adds .. be carefull feeding your puppy human food all the time .. they get dependent on it and makes it much worse trying to get them to eat kibble ...