Help! Mayday!

Okay, so... (breathe in, breathe out)... while I was making the garden fence door, I blocked the doorway with a couple adirondack chairs. I don't know why I thought that would keep the dogs out. I mean, after the initial raid I had saved what I could and reseeded around it. Luna dug up the rest of the bed. I reseeded the whole bed and blocked the door with the chairs. And then, I look out the window and see Luna belly-crawling out of the garden area, under the chairs. Yep, she'd dug up the bed again. This time, as I filled in the crater (which extended a couple inches into the ground past the eight inches of cinder block), I realized that a kind of grass I haven't seen before is spreading through that bed beneath the soil. It's ugly, stiff, and aggressive. I searched the yard and have not found any more of it, so I think it came in with some soil (damn it to hell! she says, channelling Stewie Griffin). I know I've read about this stuff, but I don't recall the name of it. Can anybody I.D. this stuff? Please?