Mona protects her daughter

Tonight when we took the dogs on their eveningwalk, Mona showed us what kind of mum she is...
We usually walk down our street and take one of the side streets, we walk down that street and turn around when we come near the house where a very angry dog lives. We noticed last week that we hadn't seen the dog around anymore for a large amount of time, so today we decided to go passed the house...
When we came back, it turned out the dog was still living there. He started barking but we saw he was inside. But then: the owner was smart enough to let the dog out. The dog was barking and running up and down the fence so angrily, it scared the crap out of Grace. Right at that moment, Mona broke free, she just vanished, leaped over a large creek and ran to the fence, not barking. Viggo wanted to help her but he couldn't break free. Mona came right back when she told the other dog to back off. She jumped to the fence and came back.
We're sure she did this to protect little Gracie, because normally she'd never ever do this kind of stuff and when she came back she firstly ran towards her and 'nose-to-nosed' her. And then when she came towards us, she put her tail between her legs because she thought we were angry with her, which obviously we weren't, we were/are angry with the pighead that let his dog out while he knows we were there with a puppy. He just stood there, letting his dog do his thing, of course the dog can bark and all (after all it's his territory), but he's a real pain in the ass for all the other dogowners that want to walk passed his house.