Wayne,
More than likely you called that fox in.
There's been times that I could actually see the fox mousing off a far distance, and gave him a shout on the rabbit distress. He definitely heard it and started in my direction "with a purpose", but he just trotted along coming in.
Apparently the mice killed his hunger somewhat, and although he wasn't starving, he still wouldn't pass up a free meal. The one you heard barking could be in the same situation, or possibly mated with another.
The times I've had them come "blasting in" were after storms where they've been denned for awhile, and sometimes very early on bright sunny days.
It seems that fox really like those high pitched shrill calls, much like a woodpecker, or a bluejay in distress. I pulled the reed section out of one of my mouse squeeker's the other day and honked on the end of it for awhile out behind my house. I was heading to an appointment, but I had a couple of minutes to play. There's probably 35 acres of brush, but you can see the plowed fields out past 300yds.
When I first started......nothing. But after 5 mins, when I was about ready to turn and jump in the truck to go, from two very seperate areas of the back field, two large male red's were blasting towards me across in the open . One was well ahead of the other, and if I wasn't running a little behind I'd have scrambled for the rifle.
I cut it off quick so they wouldn't get wise, but that little call covered a long ways. Next time I'm up to Gander Mtn., or the local gun dealer, I'll grab another one or two.
I've always known that high pitched stuff, frantically blown, really excites the hell outta them....these worked very well.
Give that same area another shot....this time he could be sittin' in your lap before you know it.
Take care,
Bob