I am sorry, but I cant let this one slide
How are they being twats?
Clovers undesexed dog is going around to their place and more than likely harassing their dog.
It's not just happened once, but on multiple occasions.
The people who's house he was back at told the kids that they'd tie him up in their yard & shoot him if he comes back. Great. Thanks.
This is why i said they were being twats. 1) Threatening to shoot the dog, and 2) telling kids that they were going to shoot the dog rather than address it with the adult owner of the dog.

We have a neighbour dog issue at the moment. He keeps coming over and destroying our property, digging holes etc. Yes it is extremely annoying, and the first step is to speak to the person responsible for the dog. They haven't completely solved the issues, but we can see they are trying.