Sorry I’m not sure of the area mate. Like suggested Kelpies which I’ve done. Although Edinburgh a short bus journey. Also Glasgow not far away. Grangemouth refinery if you are really stuck. Sorry I can’t be of any great help.
PS I forgot there is also Antonine Wall which I once did. No more than a mound but historically significant. You’d be able to exercise your dogs there. I think. It’s at a place called Camelon a suburb of Falkirk.