The officer who responded took a rifle with him because an additional report came in that another wild dog was hanging around its fallen fellow pack member. The officer shot that dog. At least one wounded pack member remains at large. The dogs have some features similar to those of coyotes, including pointed ears, the shape of the face and the coloration of the legs. But there's a number of un-coyote like features too.
Coyotes do occasionally breed with domestic dogs, but it is unusual.
Tests performed Wednesday on the carcasses proved that they were almost certainly wild, or feral, dogs. There is a measurement I can do on the upper jaw. It's a ratio of the length from the premolars to the molars then across the palate. He said further tests will not likely be done. They're all the same size and the same coloration.