When you are out and invade their home range if they think you are a coyote or another canine even the old males will have very high-pitched yodeling type of howls with two or three barks after the howl with just a few seconds between them doing it over and over again, it's an agitated sound telling the offender to leave I'm mad now, I really don't want to fight you but will if I am pushed any more. They will make the same sounds if you are too close to their den with pups in it but will get out up to 500 yards from the den and out in the open to try and lure the offender away from the babies, often even if they know you are a human. The yodeling howls are extremely shrill the same as we humans' voices get higher pitched when we are startled or very upset.