After a good meal, the dogs were ready to sit back and think philosophically. The article called "To a Temporary Place in Time" made Blackie think about the style shifts she's seen over the years. People get all excited about doing things a certain way, presenting a particular emphasis, and that's all everyone talks about for a short time. But then something new and a little bit different comes along, and the paradigm shifts.
Rufus, being younger and (therefore) having both a shorter perspective and a shorter attention span, doesn't have much interest in customizing his search engine or eating his kibbles from a new self-feeding container.
So, the dogs' thoughts are that the more things change, the more they stay the same. If there's a package of blue tennis balls at the store, let Mom buy the contrasting color so she doesn't lose them in the lawn any more. They're still tennis balls, after all.