The more there is the less you see. What is it?

I have a bed, but I never rest. I have a mouth, but I never speak. I can run for miles without any feet, Cold and clear, or shallow and weak. Change my meaning, and I'm a patient man, Who will tolerate what he must, as long as he can. I will not suffer an insult or a lie; I’m a tiny river under an open sky.

People have me over, But dogs have me under. Walls wear me, As do many vehicles.

All the money in the world can't buy me. Still, I am the most valuable gift to give.

What is quarantine called in Alaska?????