In the dark wanderer's answer to "How can my party improve our overland travel speed?", it is quite seriously suggested that (skeletal) horses should use trekking poles to increase their speed.
As far as I understand, trekking poles are held in hands. Horses would have a hard time grasping them and taking advantange of them due to reasons of anatomy.
For similar reasons, we might want to say that elephants have difficulty climbing, even though they have high strength. We might want to say that snakes have problems using lockpicks.
There is, of course, also the question is a horse would need some training to use those trekking poles, or would even agree to it. But let us focus on anatomy for now.
Do the Pathfinder rules have any provisions taking into account such anatomical features of animals and monsters, or do they explicitly leave this up to the game master, or are they completely silent?