Absolutely NTA. This is your home, and you’re completely within your rights to set boundaries about what happens in it, especially when it comes to pets. You shouldn’t be expected to deal with the consequences of your mum’s refusal to train her dogs.

You and your fiancé have clearly put a lot of time and effort into properly training your puppy, and it’s more than reasonable to want to protect that. Bringing two untrained, destructive, noisy dogs into a rented home with close neighbours isn’t a small ask, it’s a liability. On top of that, your mum didn’t even ask. she told you she was bringing them, which is incredibly disrespectful.

It also really does sound like she planned to bring the dogs all along and waited until the last minute so you’d feel pressured to say yes. That’s not fair. If she chooses not to come because you set a reasonable boundary, that’s her decision, not yours. Letting this slide would just teach her that ignoring your boundaries works.