Roses are heavy feeders and appreciate being fertilized on a monthly basis from spring through summer. Do not fertilize after August in the Northeast to allow them to harden off. Many roses are prone to fungus diseases such as blackspot. If you do not have a disease resistant variety and did not spray regularly, your rose bush can almost completely defoliate. Water it well, spray it with a rose fungus spray and it should grow new leaves.
Roses require weekly deep watering also.
There is a rose bush in my yard that has been there for years and years. In the best of worlds, plan it a month or two in advance in the late summer. Use a sharp shovel and cut a circle deeply into the earth around the rose bush, no larger than you can reasonably later dig up and move. This will trim off roots that extend further out. Keep it well watered and let it grow new, closer roots.