Sounds like she is letting you know where she is - Lela really (I mean REALLY) howls when she does not know where we are.
When we leave our B's alone, we always tell them we are leaving and when we will be back. They understand. We don't use crates.
My Basenji Billy is quite undershot; he's a purebred, his bottom jaw just didn't stop growing when it was supposed to. That's okay, I'm a bit of a sucker for a dog with an underbite anyway.:) He was my first rescue Basenji.
Your most likely right… but with ads, we know that there could have been 100 takes to get it right.... so I don't think that this pup just came from the park.... Julie and Kathy Jones in So. Cal has had their B's in a couple of different TV shows... and they say it is really a long, long process with lots of retakes... of course this was just a picture shoot... but still I wonder... and it is something to remember when we are all out walking our kids... especially in the hot sun....