As I understand it, Because yorkies are a toy breed they can be fragile or easily injured. Some rescued pups are coming from a situation where they may of been mistreated and therefore not suitable for small children.
The goal of a rescue is to make sure that the pup leaving their care will be in the very best situation that they can be in,with less of a chance to be rehomed again.
I hope my answer helps in understanding. Others with more knowledge may reply. |