Four steady lights in the night sky moving quickly changing direction abruptlyWhile outside taking the dog for a walk I happened to glance up into the sky (it was a clear night) and noticed in the viewline just above the trees behind my apartment four unblinking white lights traveling together. The lights appeared a bit larger than stars and were moving across the sky at a high rate of speed like satellites (but much larger than satellites normally appear). They were traveling south and toward the horizon; I was looking west, so it seems that were headed on a southwestern trajectory. Suddenly, the lights changed their orientation relative to each other, and then the group as a whole changed their direction abruptly and quickly, away from the horizon, and then they disappeared from my view. This entire episode happened in five seconds and was not long enough in duration for me to get a corroborating witness. My dog, however, began to look up at the sky without provocation and continued to look at the sky for around thirty seconds, which is atypical for him.I have never seen anything like this and until now have been skeptical of UFO sightings, chalking up any strange phenomena that other people have seen to atmospheric refraction, military testing or just other aircraft. Tonight's sighting has certainly made me more open-minded on the matter.