You know, the original owner had the dog for 7 years. Having dogs, I know the bond that is forged in one year, let alone 7 years. The second owner adopted her dog only over a couple months ago. The orginal owner had lost her dog, and was heartbroken. The new owner had also lost her dog recently, and so she is very familiar with the pain of losing a pet. She should give the dog back to the original owner. I would give the dog back to the original owner as I’d hope someone would do if the shoe was on the other foot and it was my dog of 7 years. I think it’s selfish. There are so many dogs in need of a home that will be euthed. She can rescue one of them.
The dog could have been a way for her to develop a friendship with the real owners, and also get to see the dog once in awhile.
Given the particular circumstances it would be helpful if the shelter would let the woman adopt another dog at a discount.