Dog ears

Yesterday I worked in our attic making room for more stuff too good to throw away but not good enough to keep. The attic is large, has fairly high ceilings, is made up of two rooms and smells like bat. After an hour or so the heat and smell tends to drive one out of the attic into cooler, fresh air, zones. I needed to take a box of small stuff to the attic but noticed some items I figured I'd be using shortly, so I took the box into the master bedroom and layed across the bed with it, under the ceiling fan, to sort it out. While I was laying there I distinctly saw a pair of fuzzy, floppy, ears come up over the edge of the bed. But I was busy and figured it was my older dog the ears fit. After a moment or so, I realized that neither of my dogs should be upstairs. I looked a second time and still saw the ears. I started to call him on up on the bed but I had several items laid out and figuring my wife must be coming upstairs (how else could he get through the downstairs gate) I got up off the bed and there was no dog. I looked all over, there was no dog. I looked under the bed, no dog. He couldn't have gotten far in the few seconds it took me to get up. I went downstairs and my wife assured me the dogs were both with her and the gate hadn't been opened. So what did I see? The older dogs ears are characteristic; they are folded over, grey fur. I didn't just see them once, but twice. Of all of the dogs I have owned only three of them had the floppy ears. Two of them are the dogs I presently own and one of those two has black floppy ears. The other three dogs that I have had here, one had cropped ears and the other two had ears that were generally straight up (both occassionly carried one ear up and the other flopped, but never both down). I had a dog for almost 18 years that was grey and had two flopped ears. I wonder if I was seeing him? If not? What?