It is simply not true that you can’t teach an old dog new tricks.
Yes, you might not be able to teach an old dog to run as fast, or jump as high, or even see as well. Old has its disadvantages, to be sure. But old dogs are actually better than young ones at learning new tricks: they have better attention spans, and are less easily distracted.
No, the old dog’s problem is the old tricks: having spent a lifetime getting positive reinforcement for those old tricks, she just can’t seem to let them go.
If you are one of my many non-dog readers, think about it for a minute: isn’t what got us here all our old tricks? And aren’t we quite well-trained to seek the praise get when we do them?
Couple the power of that lifetime of reinforcement with our recommended daily allowance of pride, fear, unwillingness to admit fallibility and surrender authority. Then top that with a cherry of the smidge of shame we anticipate if we try something new and unproven in front of other dogs. After all of that, we may not even know if we’re any good at new tricks, because there’s so much underbrush to clear away before we even let ourselves get started.
Perhaps we can motivate ourselves by another adage, this one less famous but more useful: if we fight for our limitations and win, our prize is that we get to keep them.