Whiskers in other mammals might serve a purpose similar to our hands and fingers - rats were shown using their whiskers to navigate and avoid obstacles, depending on the novelty and complexity of the environment. Read about the study here.
Do dogs just like to roll in stinky stuff for olfactory camouflage? Or is there something more complex going on? An alternative hypothesis suggests that worms might use our pets to gain their own benefits...read more of this fascinating idea here.