The Blue House office of President Moon Jae-in says the adoption would raise awareness over the problem of abandonment.
Rescue group official Lim Young-ki said Friday the dog was bought from a man who was known for luring lost dogs before abusing and eating them.
The 4-year-old mixed breed named Tory joins two other presidential pets, a dog called Maru and a cat called Jjing- jjing.
Before being elected in May, Moon promised to adopt Tory after the group asked presidential candidates to adopt some of their animals.