Australian Culture

I think the main problem you're going to have here is that you're replacing native australians with a non-human species, who sound as though they'll be being better treated than the humans you're replacing -- slavery being far from the worst treatment that the several tribes of native australians suffered. I really think you'll have your work cut out to have readers not associate these dogmen with the humans they're replacing. frex tingo is the origin of the word dingo and is thus derived from the language of a people who aren't supposed to exist in your book... by using a word from the language of those non-existant humans it looks a lot like your dogmen *are* aboriginal australians, and it's going to be tough then to convince readers that the premise of your book isn't that native australians are not human. I presume you have a reason for wanting the natives to be a non-human species but you may well find yourself spending a hefty amount of the book justifying your choices rather than pursuing your original aim.

I am not keen on writer's limiting themselves because of the problems their ideas may cause others, and I'm sure it's just the summary which makes it seem as though everything else is the same except for the aborigines being replaced by dogmen (and I will confess a fondness for the dogmen myths myself and a desire to use them somehow) but if that is the only major difference between our reality and the reality of your story...

Have you considered taking your alternate history a little further into the alternate and setting your dogmen on an island or continent that is similar to but not australia (a few mentions of australia as another place would help reinforce that even if there were similarities to the world-building)? Or keeping to australia but having the dogmen co-exist (peacefully or not) with human aborogines (that would allow you to keep the tingo name also)?