Any idea what this creature is?

I was listening to an owl hoot in a tree nearby and I tried to mimic the sound and hoot back at it. The owl went silent however to my left (the owl was to my semi right) I heard a loud, quite close, deep throated, hollow, pig like scream. I thought that maybe one of the pigs got out. After a moment of silence I tried to hoot again and the sound got much louder and far more hoarse like it was more aggressive. I got scared and ran inside. Today my dog has been on alert all day and my other dog was both on alert and barking of and on into the woods all day. Today I heard a deep bellowed pig sound and my male dog woke up and stared at the bush I thought I heard it from. The pigs were out so I thought it was just a pig. Tonight while my window was open I heard the same deep hollow pig like sound but all my pigs are put away on the other side of the farm. I live far into the woods in southern Washington state. The sounds were definitely on my property however I have high electric fences surrounding my forty acres of land. I drove along the entire fence line slowly yesterday to check for any damage. The only thing I found was a broken high wire which I repaired. It looked like an elk could've caught it's antler on it and yanked it in a panic. I have neighbors that farm only cows and have horses. The closest pig farm is five miles away. Any idea what the sound is coming from?
Any idea what this creature is?
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