It's great for pet hair. We have a longhaired dog and the hair hardly gets tangled. And if it does, the rollers can be cleaned very easily because the end pieces are removable.
This means you don't have to cut everything open with scissors, as I have experienced with other robotic stick vacuums.

We don't have a dog. But I assume that the Roborock S8 Pro Ultra is suitable for dog hair. The S8 Pro Ultra empties itself automatically. This eliminates the need to constantly empty the bin (especially a topic with dog hair). In addition, pet hair and human hair no longer get caught. This was a problem with earlier models. See video: https://www.youtube.com/watch