Make sure you use the template in the sticky. Just fill out every field that you possibly can, and include as much information as possible to enable the devs to reproduce the error. If you know of a specific <pos> that reliably causes your pet to get hung up, then include that as well. Honestly though, I don't have much hope of this being classified as anything but "Working as Intended" since it would require allowing pets to fully ignore clipping/terrain in order to avoid I think.