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They can survive, but to help them I would recommend adding dolomitic lime and wettable sulfur the the soil around them. This will help keep the soil conditioned, and free from infection.

There are many copper fungicides that can be applied, but I recommend using wettable sulfur and dolomitic lime to correct fungal issues such as this. It will also recondition the soil to a more nourishing condition for the tree. You may not notice improvement until the next year, but it will kill off most pathogens in the soil.

Typically, it will shoot flowers before leaves. Sometimes this will not happen due to shock. Can you provide a photo? This can help me to better see what it going on.

What appear to be flowers on dogwoods are not true flowers. Instead they are bracts, or modified leaves that look like petals. The true flowers of dogwoods are clustered at the center of the bracts.
Both Flowering dogwood and Cornelian cherry blossom before they produce leaves, while kousa produces flowers after it has produced leaves.
Dogwoods that are unhealthy or put under stress may fail to produce blossoms. Although dogwoods thrive in partial shade beneath trees, they will not produce blossoms if they grow in full shade.
Dogwoods that are unhealthy or put under stress may fail to produce blossoms. Although dogwoods thrive in partial shade beneath trees, they will not produce blossoms if they grow in full shade.

There can be several reason for lack of flowers.
This article will help you access the plant.
https://www.gardeningknowhow.com/ornamental/trees/dogwood/dogwood-tree-not-flowering.htm

That actually looks to be a fungal dieback. It may have contracted a fungus from the soil. This is usually caused by too much water, and usually when trying to compensate for dry weather, but if the tree did not get sufficient water then it was likely already in the soil.

You may want to go ahead and use a fungicide on the tree and soil to prevent future dieback. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

The tree will never grow into the exact same shape as it was, but these trees have a tendency to sprawl out and branch over time anyway. You can likely select new leading branches and keep others pruned away until you reach your desired shape, or you can leave it to form a more "shrubby" tree.

This article will offer more information on this particular cultivar: https://www.gardeningknowhow.com/ornamental/trees/dogwood/growing-giant-dogwood-tree.htm