The rule of thirds is just one rule...there are loads. I was at camera club on Wednesday and an older member gave a presentation on pictorialism. Many things were about the framing of a shot, and the way it "leads the eye" uisng props, or perspective lines, etc.
In this doggy shot I can see a great big set of leading lines leading straight up to the dog's face. I am drawn up to his face from the right hindquarters, and then I am drawn down to the ground by his front legs...this roots him firmly in place. And he looks a big fella, so that's a good thing.
So, I like it, compositionwise, whether it is "right" or "wrong".
I like it as an image, too...only issue (and it may be my laptop at work) is a slight loss of detail in the white fur on the legs. It might look fine at home on the calibrated screen.
Cheers