Sounds like a McCloud episode.
https://m.imdb.com/title/tt0644833/
The Colorado Cattle Caper
ALIENS ,,,,,,,,,
Are you kidding me? The country is blanketed with UFOs, and now cows go missing in Colorado? This is literally the exact plot of the pilot episode of South Park. Is there any fat kid who shoots flames out of his butt when he farts?