Cats do shed tears, but this isn't always because they're sad. A cat's tears can be caused by a variety of reasons, including eye diseases, allergies, and emotional reactions.
For example, a cat's eyes may tear up if it is irritated by a foreign object, has feline rhinotracheitis, ingrown eyelashes, smells an irritating odor, has ear mites, has eye inflammation, misses its owner, or has a spicy or heaty diet.
