Dog left for dead is returned to adoption shelter.

[Catherine]

Over 10 years ago Trooper was adopted at the Perry County Humane Society of Illinois. That is the last they heard of him until a call from  a Missouri animal shelter.
Trooper was found close to death and taken to the Missouri shelter. He was microchipped and the Perry County Humane Society was called. They took Trooper back and he is being cared for. 
The shelter was able to contact the adoptive owner. It seems she moved so she just gave the dog away and never checked to see if he was alright. It is unknown where he has been or what has happened to him. She never bothered to contact the shelter when she moved. They would have taken Trooper back. They are always willing to take an animal back for any reason.
Trooper will not be put up for adoption, not after all he has been through.   He will be kept in foster care where he can be looked after. 

https://wsiltv.com/2021/01/01/abandon-do...-steps-in/

This could have ended much worse. Trooper's life was saved by the microchip.  Because of the microchip the original shelter claimed him and took over his care.
So microchips do save lives. Also there was never any need to abandon or give away Trooper. The original shelter would always have been willing to take him back.
When you take on a pet you make a commitment. If something happens and you can't fulfill the commitment at very least the shelter should have been given a chance to take the animal back.  It worked out for Trooper in the end, but who knows if there are other animals that have not been so lucky.