The spider summon has 6 PER according to the game files. It was the same in the vanilla version, though. Burn My Eyes gives +2 PER.
I am still working through character creation so please forgive my ignorance but how does a summon having perception help you? Are you able to control the summon like a companion and use spells on them to raise their perception further? If so how useful is it since I think I read the spider is only around for 30 seconds?
