You did those dogs (and yourself and your neighbors) a favor.
We sleep better knowing they are gone. We caught them on the property before at shot at them, but it was dark and we missed. A few days later, our foreman found bite marks on one of the calves. Our neighbor's border collie was sitting in the pen with the calves, and he was concerned that the border collie had done it. I didn't think so because our neighbor's dog is a regular fixture. He loves my kids, and apparently our collie. She's pregnant with his puppies. The first thought that came to my mind was those dogs that we had shot at several nights earlier. We took the calf to the vet. The vet thought it might have been a bobcat because some of the marks were more like tears from claws. That night we stayed up keeping watch. We thought that if it had been a bobcat it might have been detered by the calves size and given up. Anyhow, the next morning was when the dogs got back in. They went after the calf that they had attacked two days earlier the hardest. I think what happened a couple of days earlier is that they went after her, and our neighbor's dog came and ran them off. He then sat in the pen with the calves for protection, which is why he was there when we found them. He sleeps inside at night, and was not out that morning of the viscious attack. I rather feel like those dogs were pretty much stalking our place. They were quite determined, and calculating. We are out with the cattle very often, yet they attacked at times that we weren't just out of sight, but were away and out of hearing range.