It could very well be a bald eagle. I live in Washington as well, and Whidbey Island is known for having a very large bald eagle population. So it could very well be a bald eagle.
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eagles hate coyotes and will fight with coyotes so it probably thought thats what your dog was
the eagle was in defense mode NOT PRedatory mode its not going to bug your dog it was interested in the chickens yoru dog (coyote canine something the eagle hates) freaked it out and ****** it off so it went into defense mode
very simple
many birds will fight a dog cranes, swans, etc.. an eagle is a very powerful bird they dont put up with coyotes
WAS THE EAGLE a bald eagle or a golden eagle? only a golden eagle have very strong talons
bald eagles are much weaker and your dog would have killed it
do not assume a bald eagle is as capable as a golden eagle if it was the falconers would use them truth is a bald eagle doesnt even hunt foxes or cats