[AndyKoh]

What I believe is that the person who adopted the pet from Cerz wasn't genuinely seeking a pet, but to get animals for free/cheaply and proceeded to sell them.

I think this is often difficult to filter especially for a group like Cerz that is rescuing and rehoming so many pets each week.

It might help reduce the problem if the rescuers visited the adopter's house prior to the adoption, and created a contract that prohibits the adopter from selling it else the rescuer reserves the right to take it back immediately, as well as stating that they would pay the adopter surprise visits a few weeks down the road. Of course, such procedures require more time and effort, and might not be an easy task to undertake.

Also, I think that for pedigree dogs especially young ones, an adoption fee should be imposed to ensure more genuine adopters.