This is something in Lamiaceae (Dead Nettle family) due to it's stalk and calyces. I also think the leaf markings may be a varient colouring rather than something that occurs in the entire species. I'll have a look.
I think that may be it...check out this link http://www.nativesoftexas.com/llsage.html, it has always looked like a salvia to me but I've never seen flowers. Maybe because it is directly in the path the puppy runs...lol it's sure sturdy!
I'm sure this is right Baa! Another good job! By the way...D oblongifolia (Twinflower?) is gone. I was digging out in that border a couple of weeks ago and found it spreading madly by thick runners several feet long...that worried me. I'll leave it to the wildflower meadows :)