The issue I am having with the trapdoor spiders isn't their ability to path. The problem is that the spiders never have a chance to run, let alone hide. I am trying to advance the detect hidden skill on pets which I have had for a long time, and which are now quite lethal. The spiders die in seconds.
It sounds as though the only way to bring this skill up is to employ the assistance of guild mates. This also tells me that since the pets are not raising the skill by attacking monsters, they are not using it. This skill seems to have been added to pets with publish 97, and I am beginning to wonder why. I'm sure the designers had something specific in mind; I'm just missing it.