You're not the only one coming out against the LW. Several people below you have talked about having no sympathy for the LW. That makes it pretty natural to come back with a tack that is sympathetic to the LW.

If you take the dog off the table, there's still a relationship dynamic of "I feel like he gets everything he wants and my needs are constantly being stifled", and the LW may want a way to fix that other than divorcing the dude and adopting a labrador.