Squirrels produce smooth, oval pellets that are slightly larger. Wild cat scat is more segmented, as opposed to the loglike canid feces. Piles of scat at a tree's trunk were left by a raccoon or a raptor. Look up for a nest or roost. Similarly, don't forget that scat isn't just at your feet.
Rock outcrops are often outhouses.
Small, twisted pieces of scat reveal a marmot's presence. Because it's a condensed package of information that tells you about the place you're hiking. Take coyotes, for instance. You get to learn about a nocturnal predator you wouldn't know otherwise. Scat is an advertisement.