
Hi Amy,
I've had friends' dogs stay with me for varying periods and all's worked well - but 2 full weeks is a big commitment

Great the dogs get on well but I assume they're not normally used to living within the same household for periods? Even if things go OK for a day or two, this won't necessarily last - it can be 3-4 days before dogs in a different set of circumstances (even if familiar environment) show any stresses etc (*IF* they show any at all that is ;) )
Why not have your friend look after your dog and her own for say 3 days and 2 nights and then swap to your place for the same period. If both dogs are still easy in each others company over food, sleeping areas, toys, cuddles, settling down for similar rest length periods etc., then you will have a much better idea of how well or not things will go for a full fortnight :) This way if it looks dodgy your friend hopefully has time to make different arrangements (although I'd recommend she has emergency arrangements in place anyway either with family or kennels just to cover all eventualities).
HTH, and good luck,
Teri :)