Stationary, Moving in weird pattern, Sparkling Intermittently, Suddenly vanished.

Before getting ready for work I always walk my dog. That Sunday morning when walking back home a very bright light towards the northwest called my attention, it almost seemed to be moving in an even zigzag at first. Then I saw it come to a sudden stop. It stay motionless for close to a minute(it may have been longer as well). Even my dog seemed to be looking at it and I swear I heard him growl very low and his tail was like a broomstick. Like he too acknowleged the bright spakling light. That's when I started to feel uncomfortably nervous. I knew it could not be Venus or a shooting star in the night sky because of it's triangle shape and altitude. I never heard any sound and I estimate it was maybe a mile or so from my position. I honestly feel as if I was being observed. Suddenly I started to feel a sense of panic which is very uncommon for me honestly. At that point my dog seemed to be on guard mode and stood in front of me.The object looked like a big triangle with a fluctuating bright LED beam. It moved again as if it was landing or coming close to the surface and towards our direction. I was completely perplexed and wanted to run back home but I just couldn't react. I was glued to the object in awe. Then suddenly it moved up high in the sky really really fast, and just like that it disappeared like a shooting star. I'm extremely distraught by that event. Only my wife knows about it because of how I looked when I returned home from the walk. She tried to minimize it, but I know what I saw could not possibly be an airplane or any air balloon or something. That is really all I have, and I truly hope I'm mistaking it for something harmless. I have to say that I have had a sort of tension headache that although bearable it just doesn't go away since Monday, (maybe stress I'm assuming) I'm absolutely frightened. I want to forget what I saw. Really upset I did not have my cell phone with me. I'm being honest. I swear on that. Best Regards.