I think the best way is to let the dog tell you when she's had enough. A normal walk shouldn't stress the joints at all. A 15 week old has a lot of energy and a mile should not be a problem. You might increase in a few stages, just to avoid getting halfway home and find her panting and wanting to lie down. ;-)
Another good idea is to take water along. Pick up one of those "bowl" attachments for a water bottle at any pet store. Half way through the walk, take five and offer a drink.
You'll be able to tell what her stamina is from her....
Another good idea is to take water along. Pick up one of those "bowl" attachments for a water bottle at any pet store. Half way through the walk, take five and offer a drink.
You'll be able to tell what her stamina is from her....