This is a test of commonsense. Complete the next sentence:

How to help your cat breathe easier
Watch out for nasal discharge.
Runny noses are common in cats. If your cat has some nasal discharge around her nose, it may be mucus or muco-purulent, which is mucus stained with pus.
These sorts of mucus are often yellow or green in color. Some cats with nasal allergies may have a clear, dripping discharge from their nostrils, but this can be difficult to spot if the cat regularly licks it away.