URGENT: Border Collie people....

 Wish I could give you tips to catch it   BCs can be a little shy with strangers (especially when stressed), so it may or may not been lost long.  I found my second BC after she nearly got smooshed on the highway in front of me.  I went back to get her and found her under the overpass.  I opened my truck door and called her and she jumped right in.  When I went to the gas station nearby to see if anyone was missing her, they said she had been hanging around over two weeks and no one could get a hand on her!  They were tossing her food, but she wouldn't let them near.  I guess she liked to go for rides!

 Is there any way you could put your dogs inside and lure it into the fenced yard?  Might not work, but could be worth a try.  Or is the yard not totally fenced?  If not, I'm not really sure what you can do aside from continuing to toss it food (and I'm sure you thought of that).

 Oh, and this is a total long shot but...have you tried telling it to "DOWN"?  I only ask because if it has been in herding it might respond.  Very long shot.

It started raining last night and was so dark I don't know where it went, it was still dark and raining this morning.  I hope it's just hiding back there.

 If I see it again I will tell it to down.  I did say "come" to see if it would, but it didn't (I also have a "twitchy" dog that would probably act the same toward strangers if she ever got lost, but if she hears a clear command she knows, she just does it on autopilot).

A section of my yard is fully fenced but it's 4' agricultural fencing with various gates made of 3' expen panels.  My only "escape artist" is thankfully not a jumper (my other two can clear it no problem but they don't run away).  If the dog was spooked, it could probably clear the gates instantly.

 Well, I hope it's ok where ever it is   It's good of you to try regardless!  Bummer about the fence...I figured you would have already tried it you had the means, but it was worth asking.

It's back.  My neighbor's dog was barking the bark that means there's another animal in our territory, sure enough the BC was sniffing along my fence.  I think b/c I did a long track with Nikon earlier and used some yummy smelling stuff (my yard is very large so there's the fenced portion near the house, then the rest I use for tracking).  I went out with more food and shook the bowl but it only scared the dog.  I threw all the food over the fence anyway.  I was going to open the back gate and lure it in, but changed my mind.  For one, my dogs would escape if I let them out to potty, and two if the BC came in, I'd somehow have to get back there going through the yard to close the gate without it running back out.

 I'm glad it's not a highway victim!  Well, I guess the only hope would be to keep feeding it and hope it eventually trusts you, as long as it is smart enough to stay out of the road.  I'm so glad it found your yard instead of some scary person's yard!  Please keep us posted!

You might want to consider "here" with your eyes averted. (I would even stand so the dog could approach me from behind.  Many working BCs are trained not to move ahead of people unless given specific permission)  This behavior is very typical of the BCs I have encountered prior to their getting to know me.  Come could easily result in a clockwise movement (if there has been herding training as many folks will use "come" as a command for a short (verses long distance) movement. 

Keep your eyes averted and high.  The dog may be more inclined to move closer if you do that.

 Why don't you PM Becca and see if she has any ideas?  The fact is that if the dog sucked at working sheep, it might have been dumped.  So, if you can't catch it after a while, maybe call Border Collie rescue to see if they will pull from your local shelter if animal control can trap the dog.