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What you say above about your sheltie's behavior being not normal isn't true - it IS normal for a sheltie, it would be more abnormal for a sheltie to attack the chickens. Welsh Corgis were actually bred to herd and protect poultry and shelties were historically used for this purpose, too. Here's a photo of a Corgi guarding a chicken flock:
You can read about this dog at
http://www.freewebs.com/dogsavvy/dogs.htm
Scroll down to the section titled Kachina's Windtalker Legacy.
And here's a bit from a page about the history of Corgis:
http://www.jimanie.com/Corgihistory.html
" the corgi in Britain was used as a guardian of the farmyard and helped to collect the domestic fowls. With poultry wandering freely around the farmyard, there was always a risk of them being taken by predators, and the corgi could guard against this. They were also quite useful in gathering the flock so that they could be housed for the night. When the huge flocks of geese were reared in Wales as a source of income, they were always a problem to guard. Taking them to market was quite a chore, and the only way to get a large flock of these large, quarrelsome geese to market was to drive them along the road to the town holding the market. Corgis were unsurpassed in this task, and working in teams along roads they knew they could anticipate any moves for escape a flock might make. They were fairly silent workers, as too much noise would only serve to scatter the flock, yet they were strong willed enough to control any goose that lagged behind or strayed."
The most dangerous dogs to have around poultry would be the sighthounds: greyhounds, whippets, wolfhounds, rhodesian ridgebacks, afghans and related breeds. Those dogs are bred to chase small fluffy animals and kill them - that's their historical purpose just as Corgis' historical purpose was to herd and protect.