A lot of mammals do have eyespots. Specifically "mid-guild" predators such as raccoons, coatimundis, ringtails, foxes, raccoon dogs, many opossums, skunks, red pandas, civets, etc. It's thought to be an anti-predator defense, with the eyespots or face mask being places further back on the head. A predator might mistake these eyespots for its actual eyes, and because they're placed further back they create the optical illusion that the animal's head belongs to a much larger animal than it actually does.
This is a photo of the gray four-eyed opossum (Philander opossum). It's called "four-eyed" because of the two eye spots it has just above it's eyes. It's thought that the position of these spots mimics the position of the eyes on a much larger predator, so if a predator like a raccoon or a coyote sees the opossum they'll mistake it for a much larger predator and they'll leave it alone.