Hooray! The enclosed dog park–with lights soon to come–opened several days ago at 11th and R Streets NW. The entrance is on 11th Street south of R on the east side of the street. The park is adjacent to Shaw Junior High School. For now, the hours seem to be from around 7 a.m. to 7:30 p.m.; the park will remain open until around 10 p.m. (I believe) once lights are installed.
I took our dog there last night. The park is nice, with about 75% covered with pea gravel and about 25% with mulch. It took our dog a little bit to get used to the rocks, but she soon adjusted.