Ben Do you know if I should prune it once it goes dorment in the winter or just leave it like that and also can you give me more info on what that is like if it gives any flowers?

Have you ever let it grow out? It looks like all of the growing tips have been cut back repeatedly - if that's the case that would explain the lack of flowers.

If you want blooms, I would not prune it and let it grow out quite a bit. It looks like it would grow in a rather loose and sprawly manner if it were not pruned. Allowing it to go back to it's natural shape would let it flower. I'm sure it does flower, all roses do.

We did prune it since we thought they were blind shoots this rose was also behind a big bush that we took down and not getting a lot of sun.

Mario, I don't think it's fortuniana. The leaves are not nearly narrow enough, they aren't shiny enough, and they aren't in 3's. It likely is rootstock, but unless it's Dr Huey I couldn't make a guess. Either way, it's probably a rose that only blooms once a year, and it will only bloom on wood that grows the year before. If you prune one of that type at the wrong time, you're cutting off the growth that would otherwise bloom. If you want blooms NEXT year, you can't prune now, or at all, until after it does bloom. That one has been pruned so severely it might not even bloom next year, it might take another year of growth. Either way, don't do more that minimal tip pruning until AFTER it blooms the first time. When it blooms, if it's Dr Huey it will look like this.

Yeah when we discovered the rose bush it was covered in powdery mildew because it was behind a big bush that was blocking the sunlight that's why we decided to prune it.

Mildew is the result of genetic susceptibility in combination with dry soil, as along a building wall where the concrete foundation is sucking water out of the soil. Plus leaves being kept damp, particularly overnight. And not the result of another plant shading the shrub. Except perhaps where that shading might help keep the plant damp for an adequately long period, I suppose.

You don't say where you are - indicating your geographic location when posting is always a good idea - but late summer on the Pacific Coast with its dried out soils and summer dews or fogs is perfect for mildew.

Yup we live in a high desert and the soil is hard and dry we also have this rose bush in the front which may be the same as the one in the back any comments? This one also only gave roses once and not anymore.