Welcome to Yorkie Talk. If you need help, you're sure to find it here. I pray that you find Peekaboo. Does he have a tag on? Hopefully someone will call soon and I guess you've already checked the animal shelters.
Congrats on your new baby. Sorry you're having a problem. Can you talk to the breeder about it? Your puppy may need more time with the mom. Sometimes breeders recommend keeping them until they're 12 weeks old.
