It's a brutal time to plant a tree, especially one that's fond of cooler weather than we get. I would shade it, if you can, until the temps drop a bit, and avoid overwatering.

Dogwoods are one of the first trees to call it quits in the the fall, so I wouldn't be too concerned if the leaves start to change soon. I was up in VA this weekend and they are already starting to change up there.

Thanks, NIcole. From what I've read the Red Twig Dogwood is a shrub, not a tree, but I'm sure that's neither here nor there. I knew it was probably a risky time to plant it since the price was marked way down (it was cheap enough I didn't mind risking it). But it looked so good for the first little while after I planted it that I hate to see it looking unhappy now. I'm going to take your advice and figure out some shade for it. Thanks for your help!