Dogs are not affected by the same cold viruses that humans catch, but they can experience similar symptoms that are indicative of kennel cough, distemper or allergies. Canine symptoms that are similar to human cold symptoms include coughing, sneezing, nasal discharge and watery eyes.
In dogs, nasal discharge that is clear usually means that the dog is suffering from allergies, while thick white, yellow or green mucus can be indicative of distemper or kennel cough. Irritation from excessive discharge can lead to nosebleeds and bloody discharge from the nose. Dogs that experience cold symptoms for an extended period of time or thick, colored mucus for any period of time should see a veterinarian immediately to rule out potentially fatal illnesses.