(when they are sold to english speaking people, they have to use german and teach the dog the english equivalent).
I don't buy it.
I did watch a great documentary about animal language, though.
There were a troop of monkeys that were relocated from somewhere (India, maybe?) to San Antonio Texas.
This troop socialized with other troops when they were in India.
Researchers put a poisonous snake in the area of a troop that remained in the area and recorded the sounds the monkeys made.
Later they played that sound back, and the monkeys all acted in teh same way they did when the snake was there.
They played that same sound for the monkeys in Texas, and they acted as though the poisonous snake was there.
Next, they introduced the Texas monkeys to a rattlesnake.
None of them had ever seen a rattlesnake before, so they didn't respond in their usual frantic manner when a poisonous snake was around.
After some investigation, and the snake showing it's fangs and such, they realized it was dangerous and started the frantic behavior again.
When they brought the rattlesnake back (it may have been a few times, I am not sure), one of the monkeys made a call and they all acted like there was a poisonous snake there.
THEN, they brought that sound back to the troop in India, and when they played it, the monkeys did not react at all.
It seems that the Texas monkeys made up a new warning call (word) for this new thing they discovered.
It was regarded as the first time a non-human animal was witnessed developing language.