Certainly, there must be some old dogs out there who can learn new tricks.

Maybe people have sold old dogs short, writing them off too quickly.

Or…

Maybe most old dogs have written off humans, for giving up too quickly.

Or...

Maybe, under too much domestication, old dogs have evolved to rely on humans to evolve better teaching of new tricks.

Or...

Maybe old dogs need to be hungrier in order to learn new tricks.

Regardless, I’m convinced some old dogs can learn new tricks.

PS: On top of all this, there's that admonition about 'Letting sleeping dogs lie". I cannot see how sleeping dogs can possibly be liars...I need to see some concrete evidence waking dogs are liars before I can accept the concept that sleeping dogs can be liars. Seems to me it is time to reconsider the value of all the ancient wisdom involving our canine friends.