Great points! Certainly it would be very nice to do this with better recording devices. It would be interesting to look at some dog barks with an ultrasound recording device like they use for bats, something like the Audiomoth.
I have read that adult cats both hear and communicate with ultrasound, and that when they want to communicate with people they are essentially using their version of baby talk so we are able to hear them. I hadn’t heard of anything like this for dog communication, but just looked around a little bit and found that dogs do produce some infrasounds, but they don’t hear them, although they probably do feel them. They are able to hear well into ultrasound, but I’ve not found anywhere saying that they produce them or use them communicate (although it is a bit tough to search for since so many hits are just about the fact that they hear ultrasound). Do you know of anything specific about dogs producing ultrasound?
I agree, some high range microphones placed around multiple dog interactions would be great, especially with some cameras tracking movements and actions.