For over a half-hour, I've been hearing this high-pitched barking from my neighbors yard. It sounds desperate, but not completely sure about anything else. But it jut goes on and on and on and there are little breaks, but it always starts back up again.

I don't know what it is, but I'm starting to worry that Shilo is hurt. Shilo is the dog that lives at the house I'm hearing the sound come from.

Does anyone have any idea what it might be?