i liked that quite a bit, although i feel like the mommy blogger made a lot of assumptions that don't seem warranted (but maybe they are if you read the full book), and was a little harsh on the purportedly male mustard colored dog. what is he (it) supposed to do, lie about his (its) hat preferences? where does that get you? and red hat-wearing dog was asking for an opinion, it's not like the mustard colored dog was out there shouting criticism at random passers-by.
i do think the mustard colored dog should have had some lines by its tail to indicate wagging during the exchanges though. hat dog was wagging at him (it) and you have to construe not wagging in return to be a deliberate and cruel snub (possibly hat-related).