[greglepore]

Professionals move deciduous trees when they're dormant, but you may not have that choice. The rule of thumb is that the rootball is as wide as the width of the canopy.

25 ft dogwood is a big mature tree. Assume you can get the backhoe in there?

We've had a mild wet early summer, but moving a tree in July is pretty much out of the question. Otherwise, Baz's advice is pretty good.