Counter surfing was a problem with my last foster, he was 30in at the shoulder so his snout was right at counter height. For a few weeks he could be in the kitchen if I had him on lead, I could feel the tug before it was too late and correct him before any damage was done. I keep all food stuff off the counter except what I am immediately working on, is it possible for you to build a little shelf at the back of the counter? About an additional 15-20inches? I use something like this to put the good stuff out of reach when I have to walk away for a moment. I also clean as I go, so that slop on the counter gets wiped down immediately after it occurs and I dont have dogs nosing it. Ava never counter surfed because there was no point, she couldnt reach and I would reward her by staying in her place. Ailyn's anchor points is a really good idea, I have always done somthing similar with Ava. She has her place, which is out of the way, but she can see everything, if she stayed there I would toss her tasty tidbits from time to time. This is the same place I send her when guests come over as well.
"We had a surfing incident where the thanksgiving day turkey was snatched!"
I was always paranoid of something like this happening, Loosing the Easter Ham of the Thanksgiving turkey would be a disaster. I dont mean to laugh at your loss, Ailyn........but I have visions of a great turkey conspiracy...what a prize!!! LOL talk about self rewarding behavior!!!
This is kind of like barking, it is a self rewarding behavior, they get stuff if they surf. So if you start rewarding the good behavior with something even better, I think you can break them of it, but this one will be hard because you have to think of something better than the raw chicken on the counter, OR they get a bit of it while they lie nicely. Another thought is to give a raw bone, something a little more recreational that they cant go through in 15 min. I envision something a long the lines of rewarding the stay in the kitchen with a bone or other long lasting treat, to make it even better, they only get that treat when they are staying in their place. First reward quickly then extend the time gradually. If they take it off the rug that is theirs....you make them take it back to their rug. I'm not above bribery. It's the lets make a deal of the dog world!!! LOL