This article is from the Afghan Hound Breed FAQ, by Janis Nixon with numerous contributions by others.
No, they are not. Although it depends very much on the individual pup,
as a rule the lordly Afghan doesn't like being told what to do. Up
until six months of age Afghans can not be expected to be perfectly
clean, as they are not mature enough to hold on for extended periods
of time. When training any Afghan, patience and gentleness are
required. A good sense of humour helps too.