If you were researching whether mountain lions attack and kill domestic, stray and feral cats, this photo and video probably answers the question pretty conclusively. Although observers of the video can’t be sure that the animal is a cat. Although it very much looks like it. It might be a small dog. It is a shame that the image quality is so poor. But the truth is, though, that we don’t really need photographic evidence as common sense will do. Indoor/outdoor domestic cats are a very suitable prey size for the mountain lion, aka the puma. They might be tricky to catch because of the domestic cat’s speed and agility. Although pumas are good climbers too, so not a huge challenge except domestic cats can pass through much smaller openings to evade capture.
There is no feline agreement that cats never kill each other in the interests of protecting the cat family, wild or domestic. Nature does not work like that.
The large and competent leopard is scared of the lion in Africa for instance.
The domestic cat in America is very exposed to being killed by bigger predators. The coyote is a well-known domestic cat killer. They are very resourceful. Once again, domestic cats can escape a coyote attack but not always.
Note: This is a video from another website. Sometimes they are deleted at source which stops them working on this site. If that has happened, I apologise but I have no control over it.
Pumas kill and eat prey of a wide range in size: from mice to mouse. The prey size varies as to where they live. In temperate regions they regularly prey on animals as large or larger than themselves while in tropical regions prey is much smaller weighing less than half its own weight.
SOME MORE ON PUMA ECOLOGY:
Pictures of a puma on an iceberg off the Upsala glacier in Patagonia’s Los Glaciares National Park, Argentina