5. You can never teach an old dog new tricks
This happens to be a trite saying that has got many individuals taking up its meaning literally. Its real meaning is, however, quite different and mostly refers to the obstinacy of some individuals or in this case dogs.
Fact: While it isn’t simple to teach an old dog new tricks, the fact still remains that it can be accomplished. An old dog might no longer possess the reflexes or energy of a young dog, but with some patience on the owner’s part, introducing new skills to an old dog is perfectly feasible.