My husband, Peter, had never had a cat before we adopted Felix, and Felix is taking full advantage of this.Peter didn’t know, for instance, that cats require tuna, right out of the can, every night at precisely 8:30 p.m.—until Felix informed him.Peter did not know that he was not permitted to be late, nor was he allowed to run out of tuna. Felix has a firm no-substitutions policy.Peter now understands this.Peter didn’t know the kinds of games that cats like to play, so Felix had to train him from scratch. This has been a lot of work for Felix, but ...