When I lived near Aviemore I was cycling in the woods near boat of garten in winter, full snow cover, probably about 3 miles from the village, I crisscrossed all the tracks on my 29er rigid single speed going hell for leather, defo faster than anyone walking or even riding nearby, and I was sure there was nobody about. I was riding on a small track back to the main track and saw this... thing... running in the snow covered undergrowth (deep heather) parallel to the path, in fact running full pelt, and it ran up the bank and over the track onto the other side. As you can imagine my heart was booming like nobodys business and the adrenaline was pumping, what the hell is that, is it going to attack me? First thought was a boar, but as it ran across the track near to me (apparently unaware I was even there), I saw it was a really really big dog, one of those big shaggy mountain shepherd alsation crossed with a bear type dogs. If I hadn't had a proper look at it as it crossed the track only a few metres in front of me, I could have been filled with all sorts of speculations about it being any manner of big animal, and if someone had told me that there had been big cat sightings nearby I could easily have thought it was that. No idea if it was just out for a sprint miles from home, miles from owner, or if they were nearby and I just hadn't clocked them. Despite not being able to shift up a gear I cycled back to the village at snow-slidey warp speed. Anyway, sorry, cats. meow. Never saw a wildcat up there, sadly.