Woman here and everything she said is accurate. It's intense, overwhelming, and completely amazing. I've never had a guy I've enjoyed more than my dogs. It may not last long thrusting wise, but the sheer sped and power and for me personally, level of submission is enough to make me cum. I am really into BDSM and PERSONALLY I find it to be incredibly degrading and submissive to be used by my dog. My thoughts of "he's using me to get off and doesn't cate if I enjoy it" are really powerful and I love it. 100% understand that not everyone sees it that way and that's fine, but for me, it's half of the whole thing.
To be more detailed on that:
The feeling of him on my back, his fur pressing on me. His claws digging into my sides. The fast thrusting that knocks away my breath. And then the knot, that deep pressure and the wetness and just being forced to take it, to stretch my pussy around it. And I'm stuck there until he's done. His knot also presses hard on my g spot so that's fantastic