saw an item posted so called free,then within a matter of minutes the cost to have is 250.00 payable with western union/walmart..Seller claims to live in Texas,but location of city varies,to send money to the main person who will deliver item claims to be in Texas too but phone number is in Nebraska, and ID's under an old facebook page for shelter animals strangely selling just what this person is claiming to rehome free...

It is a scam.
See:
https://www.consumer.ftc.gov/blog/new-dogand-scammers-old-tricks

If you are looking for a new pet, visit the local animal shelter.