Report 7830: Two teenagers witness something running from a pack of dogs on two legs, screaming very loud. The next day large five toed tracks are found

When I was 16 back in 1967 I was staying at a friends house on the next street over from were I lived. It was around midnight and we were watching TV when we heard some dogs barking like they were after something. We looked out the door and we seen something big like a large human running with the dogs chasing it. It ran under a street light but we still couldn't make it out. As it ran it made some terrible screaming like I have never heard before. The next day I went home and my mother asked me if I heard the terrible screaming sound last night. She said our dog ran and hid under the bed and it scared my sister to death. She said what ever it was it ran right beside our house. I went out and did find some very large bare feet tracks by our house in some mud. But nobody thought much about it when I showed them. We are by some railroad tracks and some woods so I believe it was following them and maybe came looking for food. I still can't explain where the dogs came from. My mother still laughs about our dog running and hiding from the noise it made.