Lissa, a long-haired Chihuahua mix, constantly had watery eyes. Curious about why Chihuahuas cry, I found the reasons vary from genetic predisposition to allergies and infections. Symptoms like excess tearing during teething or allergic reactions can be normal, but issues like eyelash disorders, blocked tear ducts, or entropion may require veterinary attention. Careful monitoring and a healthy diet may help prevent tear stains and ensure a Chihuahua's overall well-being.