This is a dog that is for sale, by owner. This sounds like a sale, not a rescue.
All, please do not buy into or encourage others to buy into threats of what will happen if he's not sold quickly! The owner is control of what happens to him. If they're good people and love their dog, there's no urgency. If they're not, well....
That's a common emotional blackmail/fraud technique used by shady owners and their accomplices on the Internet to extract cash out of soft-hearted people -- "pay us or we'll do X [give him to a high-kill shelter, shoot him, turn him loose on a highway, whatever]." It's a very common ploy in my area, and it's a scam -- as soon as they get money for this threat, they get another dog and repeat the process with someone else and make a livelihood out of it. It's extremely common on CL, sometimes using a picture of dog in a bad circumstance (on a chain, in mud, etc.), or sometimes using a story of something sad going on with the owner, and when someone writes asking to help get the dog into a better situation, they get a "rehoming fee" demand of $500 immediately, or else a bad thing will happen to the dog.
The description of giving him to the SPCA if someone doesn't pay up to buy him quickly sounds like a version of this. After all, what's the real urgency here? My response would be: "At the SPCA, an appropriate rescue will be able to get him out and into good hands."
Last edited by Magwart; 01-23-2018 at 11:23 AM.