Round table

because upgrading Gogs can hinder the construction of, for example, Devils, Greater Pit Fiends, or Efreet, especially when they are upgraded. As for the benefits of building them, consider this: which of the Gogs have ranged attacks? And even then, the only hero capable of enhancing them is Kal'Kh, who is quite rare at the start and not easily made the main hero. Without ranged attacks, even the infamous Walking Dead will take a long time to kill. And if you also give Kash a Ballista... well, that's a whole different story.
As for not building Dogs, it's because you can build, for example, Efreet in a Castle, or Efreet and Pit Fiends in a Stronghold/Castle, or "Devils" in a Fortress, even without Dogs. They are usually built if there's a surplus of resources or for demonology. But not very often. For example, Dirty, in his famous example, built 60+ demons on the second day and also built Dogs, but only to make the demons. (there was also a surplus of resources there). So, if you can't build Efreet, or at least Pit Fiends, then you can put in Dogs – it might help. =)
And when comparing 2 Efreet at level 113 and 5 Dogs at level 113, it's hard to make any argument in favor of the second option.