I plan on sending our daughters dog away after she broke her promise to us.
Did you also make the same promise?
Yes, I made that promise for which I'd be forever grateful.
It is okay to be upset that somebody broke a promise. It is hard to trust them to keep their word in the future.
I think it is a good idea since we are having trouble trusting her when it comes to keeping her word.
Well a punishment seems necessary for your daughter lying to you. Not sure if giving away her dog is necessary, however you could simply ground her or take away her phone or something. Breaking a promise to your parents is certainly not something you want your kid to do.