No advice--I'm trying to let the conservancy behind me expand into my back yard, b/c it should not even be grass. My sister had 2 coonhounds in her yard in FL and no amount of care saved it. If you are really frustrated, consider an internal fence for a "dog free zone" and landscape that to your heart's delight. Or, limit the time your dogs are in the yard--act as though you don't have a yard and get their exercise as other folks without a fenced yard must do. I'm relieved that this is one thing I just don't care about, b/c I'd get all twitchy if I did. Good luck and sorry I'm no help.
Radar, Aussie/BC mix, b. 2/27/2012
Jett, GSD foster pup, b. 7/15/2018