Jayde was born and raised in her breeders finished but not carpeted basement. She and her littermates used the concrete to potty.
When I brought her home I of course started potty training her. But she wouldnt go in the grass. I knew she had to go at some point so I let her show me where she wanted to go. She chose the sidewalk leading up to our house. Ewww!! Not gonna happen.
She will use the grass now but I do notice when we are out walking she will just start pooping in the road.
So I think that you should do what you normally would do when training a pup/dog to potty in a spot you want them to. Just take them to the concrete instead. I agree it's gross but......you have to do what you have to do.