danisgoat
Moderator
I Perhaps a child fell in love with her.
It could be explained to a child.
The parent could say, what if you got lost and a nice family found you and loved you and wanted a child just like you. And they decided it was better to keep you because their daughter was so excited to have a sister and they didn't want to upset their daughter by giving you back to your parents.
Kids are very easily influenced. The parents just didn't want to give the dog back at first for whatever reason.
Good news is, they caved in and gave the girl back.