Strange occurrences experienced by a family on their property outside Yale witnessed in Payne County, Oklahoma

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My teenage son is a night owl and was awake in his bedroom late one night/early one morning. Approximately 2 or 3 am, he heard what he described as a "metal scraping on wood" sound outside his bedroom window. He then heard several inhalations/exhalations as if something was sniffing at the window followed by a loud grunt. He described this sound as "buck snort" or someone clearing their throat. We have 3 little dogs in a pen right by his window and he reported that the dogs were not barking which is odd because they usually bark at everything!! He immediately got out of bed and spent the rest of the night on the couch. He wouldn't sleep for several nights following this incident. He told me about it the next morning. When I got home from work that afternoon, I went around to his window to investigate. The window was open approximately 1-2 inches. We have casement type windows and he had rolled them in but not latched them so they could have been opened from the outside but it would hav...