I really need advice on this!
I live on half an acre and I have a neighbor that allows their rooster and hens to roam around the neighborhood, that includes my back yard

. I have one hen and 9 six-week-old chicks and one of my chicks looks like it may be a cockerel. I always come home to find that rooster in my yard with my hen and he has successfully mated with her before (we have one chick as proof) and has even gotten her to follow him out of our yard (I don't want her to be road kill!). I'm afraid that the rooster will try to kill my little cockerel since the rooster seems to have claimed my hen and back yard. Also, I have 2 dogs and they don't bother my chickens, HOWEVER the dogs have attempted to attack the rooster and his ladies that come into the yard whenever they're stupid enough to come over when I have the dogs out. One of the dogs has already killed a rooster that came into our yard from the same neighbors, and the other dog has attacked the current rooster TWICE. Most recent attack was this morning. I thought that the first attack would keep the rooster away but apparently not. If this continues I'm sure that I will be finding a dead rooster in my yard pretty soon. My neighbor doesn't seem to care about the welfare of their chickens since they lay their eggs all over the place and I have found dead chickens on the side of the road before. What can I do??? Please help!