My wife and I were walking our Golden Retriever about 11:30 p.m. on 10-05-15. We were in the desert area across the street from our RV park here in Bullhead City, Arizona. I looked up to admire the stars and noticed a red and yellow-orange light moving south-southwest following the Colorado river. Absolutely no sound. No prop wash, engine noise, no aircraft marker lights, nothing. It was approximately 800'-1000' up in the night sky. May have been closer, at night it's difficult to be sure. The lights appeared to blink once in awhile but no pattern. It continued south-southwest until it encountered a cloud bank and disappeared. Moments later another appeared in the northern sky and followed the same path as the first. Our dog was not disturbed at all. Really strange.