Observer yells at dogs from window and hears return scream witnessed in Linn County, Oregon

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It was the middle of the night and I was woken up by the dogs barking, I opened my bedroom window and yelled "shut up" and when I did something screamed, I mean SOMETHING SCREAMED - I have never in my life heard what I had just heard. I went to get my husband up as he had fallen asleep on the couch that night. I was in the living room and could hear the dogs barking frantically in the back yard which is backed up to a mountain. I opened the window to call the dogs back and heard what ever it was moving along the back side of the yard. It was a definitely a very large animal by the sounds it made while running. I yelled for the dogs and what ever it was stopped and I could hear it breathing. It was a raspy sound and very close. It was too dark to see but Im sure it was stopped looking back at me from a distance of approximately 75ft. It then ran up the hill. By the sounds of its running I'm convinced it was on two legs, not four and that scream was nothing I had ever heard before or eve...