Weepy eyes, or epiphora, can be temporary (because of an allergy or irritant) or permanent (because of a structural defect). Some dog breeds are more prone to epiphora than others, such as the poodle, Maltese and Shih Tzu.
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Breed
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The tear ducts of some large-eyed dogs, Chihuahuas in particular, weep frequently to keep the surface of the eye moist and free of debris.
Food Allergies
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Weepy eyes can result from allergies to commercial dog foods. HolisticPetInfo suggests reading labels and avoiding "BHT, BHA or ethoxyquin and food coloring."
Irritants
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When eyelashes grow inward toward the eye or when foreign matter (like a speck of dust) gets trapped beneath the eyelid, a dog's eye weeps in an attempt to dislodge the irritant.
Blocked Ducts
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Dogs' tear ducts drain into their nasal cavities in part to keep the nasal passages and snout moist. Dogs with narrow or partially-blocked pathways may experience excessive external tearing, or weepy eyes.
"Rust"
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VetInfo says the "rust" stains on fur from weepy eyes are because of iron-carrying molecules being broken down by bacteria. Though tetracycline can help, it's best to check for problems like glaucoma or uveitis.
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