* A cold: This is the most straightforward way to describe it.
* A sniffle: This indicates a runny nose, a common symptom of a cold.
* A cough: If the dog has a cough, you can mention that.
* A respiratory infection: This is a more clinical term, which you might use when talking to a veterinarian.
It's important to note that dogs can't catch human colds (although they can get their own versions of the common cold). If your dog seems unwell, it's best to consult a veterinarian.