You train recall? It's like the first thing you want to train, and arguably the only mandatory thing you need to teach a dog. Notice how the collie in the video came back as soon as it was called?

someone’s off-leash bear lmao

Is this sarcasm? That's a black bear, generally safe, you can tell it's not protecting it's babies because it ran away from the dog. Also I live in a very rural area and I've only ever seen a black bear once on trails. Meanwhile I've almost run over a dog not on a leash several times, I can't imagine how difficult riding with a leashed dog would be.