This weed grows along the ground like an ivy with dark green leaves. It sends up spikes of small purple flowers/seeds. It looks like pics of purple loostrife, but this stuff grows close to the ground.
1 month and 2 spray applications of Slay Maxx later. The dock is fading but not dead. Most of the leaves are 70 to 80% reddish with holes in them but still 20% green and seemingly still alive. I gave them a 3rd dose of spot spray