Sick Dog Symptoms - Know The Signs Dog danger signals. It's an unfortunate fact of life that, just like you, your dog can fall ill. . Diarrhoea. . Repeated vomiting, gagging, sneezing or coughing. . Refusal to eat for over 24 hours. . Excessive thirst or urination. . Red or swollen gums. . Difficulty urinating. . Runny eyes or nose.
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