Q. Is something wrong with my Pink Flowering 10 year old Dogwood Tree?
It sounds as if the tree may have Spot Anthracnose which is described in a USDA brochure on Growing and Maintaining Dogwoods. Here is a link:
You might also want to check with the Cooperative Extensive Service which is located at 675 Sansom Street. The phone number is 215-471-2200, and the email address is PhiladelphiaExt@psu.edu. Good luck.