Possible approach to homes at night near the Des Moines River outside Saylorville witnessed in Polk County, Iowa

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about 2 or 3 a.m. I was awakened by my st. Bernard puppy who was quite upset. I soon learned why as I could hear my neighbors 2 dogs, a great Dane and a husky by the back of our house crying loudly. I was almost 14 at the time and was quite scared by the commotion as was my puppy. I looked out my window towards the cornfield and swamp behind the house but saw nothing but the dogs staring out towards the swamp, they started to go back out to the darkness in full attack mode. they weren't even barking but like screaming at whatever it was out there. I then heard a large rustling sound in the dried reeds by the fenceline. It sounded as if the dogs had been hit and they ran back to the safety of our back porch light. I ran to Moms room but found her at our back kitchen window staring towards the commotion. When the dogs would silence a little we could hear something walking in the reeds. It sounded very heavy like a cow but made no sound other than the walking noise and extra commo...