Hi Bushwhacker,
I've seen just these tracks before and I believe they are wild boar.
There are boar up in Glen Dessary and Pean which I think need thinning out. They can be a pest and, as I've discovered, are highly aggressive if you inadvertently stray towards their young.
I was in a forest just north of the young Danube in Germany, an area rich in Neolithic and Celtic bronze-age archaeology, and came across a hunter's hut and roasting pit (the Europeans have it sussed), so went to gather wood to get a wee blaze going. 10 seconds later I was legging it back to the hut with a disgruntled wild pig hard on my heels. I ran into the hut and slammed the door behind me one second before the pig's head rammed into it. It was then that I realised the right hand wall was missing.
Thankfully, the wild pig was marginally dumber than me and didn't figure it out at all.