Holes in dogwood tree leaves
It appears to be spot anthracnose on the dogwood. Most likely a result of the very wet spring we had this year. Here is some good information about it from Clemson Extension: https://hgic.clemson.edu/spot-anthracnose-on-dogwood/. The weather pattern has changed now to a dryer pattern. So you are probably not seeing the disease spread to the new leaves at this point. If so, you wouldn't need to treat unless things turn wet again before fall.
As leaves drop, gather them and trash them to remove the disease for better control next spring.
Next spring you will need to start treating the trees with a fungicide every 1-2 weeks from before the buds open to when the leaves are fully expanded. A list of fungicides that you can use can be found in table 4.1 on page 4.9 of our pest management guide for ornamentals: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/456/456-018/ENTO-336D.pdf