I have been postponing posting on this thread because I just don't know what to say.
I joined this forum after your beloved Duke was already gone and I remember you getting Dasher.
If I recall correctly he was already 10 years old and had heartworm.
He was one lucky dog to have found you. You helped him recover from the heartworm and gave him MANY more wonderful years.
I am so sorry for your loss.

RIP Dasher