traveling south to north appeared moving just above treeline height large orange light that reduced to pinpoint then disappearedWe let our dogs outside and even though we have a fenced backyard, we for numerous reasons, always go outside with them. We couldn't help but notice the large, orange, glowing light in the sky. It was moving extremely slow (moving South/heading North) and although it was probably higher, it appeared to be off the ground at just above cottonwood tree height. As this object continued to move the orange light reduced down to (for its size ratio) a pinpoint and then its light seemed to disappear. What was also interesting about this strange, flying object, was its dark, massive size which became more apparent with the reduction of its orange light. And, there was no sound emanating from the object. This flying object certainly gave us pause and caused us to question what kind of aircraft it could possibly be.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))