http://www.sciencemag.org/news/2020/05/dogs-get-difficult-when-they-reach-adolescence-just-human-teenagers

Teenage dogs, like teenage children, ignore their caregivers.

When our Scottish collie puppy reached doggie adolescence, she suddenly stopped obeying my commands. Previously, if I called “come,” Annie would fly across our yard to my arms. Now, the 8-month-old gave me a defiant “make me” look and ran the other way.