Q.damage to dogwood tree
I tore a small branch off a young dogwood tree. What do I do? Is there anything I can do?

If its a clean injury, wash it with a soapy water mix and allow to air dry.
If the injury is jagged, you can clean up the injury.
Do not wrap the wound. Watch for signs of insects that may fine the wound.
It should heal and the tree recover.
Here is a link with more information.
https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm