It's been observed by one television documentary that, among other things, included a dog with a collar in one of these shots (with no explanation for the context).

There's no peer-reviewed scientific research describing this phenomena. Or even any attempt at gathering any data with something resembling scientific rigor.

A simpler explanation is that these dogs and baboons are just... Living side-by-side in a garbage dump. And that the film-makers just didn't include any footage that didn't fit their narrative.