What's the difference in training a dog can take/learn if you get a young puppy vs a dog that is several months or a year old?
Older dogs have a harder time honoring imo.
When they are 8-10 weeks old, you can teach them simple things that become part of their psyche. Sit, Stay, Come...all to a whistle as well. Older dogs have had opportunities to "learn" things you don't want them to do.
two cents worth....