Why Do Dogs Noses Run. Sometimes the answer lies in the simplest explanation. As in humans, there are a variety of reasons why a dog’s nose might run, including irritants, allergies and infections.
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So they may push people or other animals using their noses to bring them into a group. Dolicocephalic dog breeds (dogs with really long noses, like the borzoi) are more likely to develop nasal tumors. They can also include sneezing, coughing, itchiness, nosebleeds, and breathing problems.