I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
To make a dogwood at home it helps to first work a lot of sand and peat moss into a large area of soil which is impractical. I suggest you keep the soil well aerated and water it enough to keep the soil moist but not soggy wet. Using fertilizers for acid loving plants, such as Miracid and azalea/camellia food, is a good idea. Coffee ground are fine too. Your soils are high pH and very buffered so they are not likely to change toward acidic very readily.
Thanks for the question. Please stop in again soon!
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