Went out earlier and left the back door open for the dog. Now, sitting in the kitchen

[TwoTechs]

This is it! Didn't know they were called 'whistle pigs'.
http://www.youtube.com/watch?v=pCibiJrk4_Q

I'd recently heard the nickname, but not the sound. Unfortunately, I recognize it quite clearly, and now wonder where the local whistle pig lives in my neighborhood.