Solid lit triangle heading north northwest

Taking dogs out before work in backyard tried to look for big dipper and from my right I saw white light solid shaped triangle. Quiet., moving quickly lower than a usual plane would be over our area. Light went out after about 5 seconds while I was watching it but could faintly see it still moving but then got difficult to follow. It was moving toward where the big dipper area of sky usually is at that hour. (445am)but there were some clouds in sky as well. No blinking lights on this triangle.