Your wife did nothing wrong I agree with the others.
I tried doing it the civil way , ask that the neighbor keep their dog off my property, instead the man put a gun in my face and waved it around at my young children.....then shot his own dog 2 times in front of us. When the cops came he made up a big story about how I cussed him out and was shouting at him over the fence. I don't even shout at my own children... 2 months ago it happen again he had 2 new dogs , I have a 6 ft non climb horse fence that goes from back to front down to the road, they didn't go over it or under it but they busted through it. I patched up the holes and he claimed it made his yard look ghetto sorry but I didn't have money to buy more fence , fence that his dogs tore up. So I covered it several times he kicked down the wood I put up, so I finally nailed wood up over the big wooden posts. Last year his dog got 15 of my chickens, this year it was a little less cause we came out before they could get any more.
Yes his dogs disappeared , sorry ....... He is screaming for 3 days at me over the fence calling me every name in the book then finally he tells me he is going to kill me and my chickens, and then he threatens my daughter who is 19 yrs old. That was all it took for my husband who has tried to keep the peace.
We call the Sheriff and Sheriff says you do what you have to if the dogs put foot on your property....he goes over to the man and the man makes up a big old story how I came on his property. The Sheriff said since nothing can be proved by either me or the man, he suggest that I start recording any further conversations, or even anything the man yells over the fence.
Since this sheriff came we have had no more issues with the man.
Some times doing it the proper more polite way does not always pay off , or go over well with some people.
So from now on if a dog comes on my property and is in the act of killing, and has crossed our fence line then they go poof.
I am also from the city and I hated killing any animal, I am also a big animal lover. I had to learn the hard way some times you have to do things you don't want to do.