I think we are not fully appreciating the sensitive
periods in the development of our working dogs.
This study from the sciencedaily was done on teaching wild birds a new/different song.
Click the link to read the report
Like toddlers learning to speak, young birds learn to sing by listening to the voices of adults. Now, researchers reporting in Current Biology on October 4 have shown for the first time that they could teach young sparrows in the wild how to sing a new tune. The wild birds then passed the new songs on to the next generation.https://www.sciencedaily.com/releases/2018/10/181004143948.htm