My dog has had the Da2PP vaccine and will be getting the second dose in a couple of weeks. He is a two year old cocker spaniel. Over the last two days, he has developed what seems like a cold. He is sneezing and coughing, but mostly seems to have a blocked nose (both nostrils) and nasal discharge (yellowish in colour). He often tries to breath in from his mouth and does this loud inhaling through his nose to try and swallow the mucus. Are his symptoms dangerous ? I have only just adopted him from the spca and never have any other dogs I have owned, shown symptoms of a cold. I have tried taking him to the bathroom to breath in steam and it seems to help, but then the blockage come back again. He is eating but definitely not that much and not drinking a huge amount of water either. I don't know what to do.