Go for it- dig a nice big rootball & water it in well with a solution of Vitamin B1 anti-shock plant starter & you should be just fine. Keep well watered if it's hot where you live.

Ok, the Dalhia has wilted. I have watered it pretty good, but it's not bounching back. I wonder if it's the shock of being uprooted.

I've moved dahlias up to 3 ft tall in the worst conditions: hot, sunny, midday heat. My bad. They get mad at you for a week or so and then will go on about their business. I'd just keep an eye on it, forgive it for slowing down a bit, and wait for results.

You may have irritated it some, but you didn't kill it.

ok, I will watch it. It was pretty hot when I moved it.