Dogs snore because their airways are partially blocked as they sleep. When the airways become more narrow, they begin to vibrate together to cause the snoring.
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Genetics
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According to Dog Owner's Home Veterinary Handbook, dogs with brachycephalic or flat faces are prone to snoring because of the shape of their heads. Flat-faced breeds of dogs include bulldogs, pugs and the Pekingese.
Weight
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According to VetInfo.com, dogs that are overweight are more prone to snore because of the extra flesh pressing down on their throats.
Considerations
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Allergies, mucus build-up or respiratory problems also can cause snoring in dogs. Since these conditions cause many other symptoms, you should consult a veterinarian for treatment.
Prevention
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Dogs are more prone to snore when on their backs or flat on their sides. Using round beds might encourage them to sleep curled up.
Warning
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Foreign objects in the nose such as a small twig can cause snoring, sneezing, head shaking and a runny nose. Polyps, tumors or small objects in the nose can lead to serious infections if not treated promptly.
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