I am a Lutheran, and I have read volumes of Luther’s works. I can give a long list of Luther quotes that are, let’s say, bizarre at best. It is an old saw in Lutheran circles that quoting Luther proves nothing, since Luther said just about everything at some point in his life. Whether Luther believed that his dog was going to have a golden tail at the resurrection is beyond me. Maybe he did, or maybe he was making a joke. Whatever he was doing, the best place to learn about Luther’s theological teachings are in his formal theological treatises. If this is the only quotation that we have concerning Luther’s views on the resurrection of dogs or any non-human, I wouldn’t place too much weight on it.
This is another direct quote of Martin Luther, again in translation. You seem to be at odds with the entire Biblical concept of restoration. All creation, everything that ever was, made anew and restored to the intended, pre-fall state. Luther clearly wasn't at odds, and neither were many other Protestant notables, such as Calvin, Wesley and Henry, as I've mentioned repeatedly.
Now, would you care to disprove the clear meaning of the two quotes I've kindly provided for you from Luther, as some sort of bizarre and uncharacteristic blurted nonsense, as you've characterized?
Are you sure you're Lutheran? You're rather disparaging of your own denomination.