Dogwood Leaf Issue
The dogwood's brown tissues between the leaf veins are classic symptoms of a water shortage.
Dogwoods need water throughout our dry dry months. Water deeply to at least 8 inches every 3 weeks. One way to do that is to encircle the tree with a soaker hose, begin halfway between the trunk and the dripline, and spiral outward until you are a foot or more beyond the dripline.
Watering the lawn is inadequate for a tree.
Consider adding a 3-inch deep mulch of wood chips, extending from the trunk to a foot beyond the dripline.