I agree with what you say. The mountain lion would most likely jump on the back and bite the neck. Bobcat can do that with deer but I doubt they'd try it on an animal at least 4 times the size of a whitetail. On the rare occasion I've heard of a bear attack, it ran alongside the hooved animal and swatted it in the head bringing it down.Heard something rather unexpected yesterday.
Someone I know recently sold a horse to some folks that live near Whiteville (about 35-40 miles from here). He got a call from them yesterday; the horse was attacked by what they are identifying as a panther (also known as a cougar, puma, mountain lion).
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Historically, panthers did inhabit this area, but they are thought to have been extirpated generations ago. Rumors of their continued survival in the coastal swamps persist, but reported sightings are usually passed off as a bobcat or large dog. I would think that a dog, or even a pack of dogs, would cause different sort of injuries than a cat would, and I find it very hard to believe that a bobcat (with an average weight of less than 25 lbs.) would attack an 800 lb. horse. We have bears around here, of course, but once again, I'd think the damage they might inflict would be different....
The supposedly last mountain lion in Missouri was killed in 1927 in the bootheel. They are so reclusive though and the terrain of southern MO so rugged and remote, they could have continued to survive. I'm almost positive that my parents and I saw one crossing a windy dirt road ahead of our car when returning to our farm late one night. All three of us recognized it as a big long cat with a long thin tail in the neighborhood of 100 lbs.
In the last 20 years about 50 of the hundreds of reported sightings in MO have been confirmed to be cougars. A couple years ago a mountain lion was caught on a trail cam in Chesterfield, a fairly well populated suburb of St. Louis, county.
Speaking of rare wildlife. I looked at a map and it turns out the woodland along Coldwater creek that Walmart cut down sending the mink my way is only 4500 feet from my house. The creek is less than 1000 feet down the hill from my house and that point is about 4000 ft. downstream from the construction. There's a wide densely wooded buffer along the creek all the way from the construction to the Mississippi river. Not so much upstream. I'm sure Walmart donated them to me
In case anyone is interested, I added a bit of US intervention history to my post reflecting on countries bad behavior over the years.
https://www.backyardchickens.com/t/693812/the-old-folks-home/20470#post_13964803