[header] How to help your cat breathe easier [title] Watch out for nasal discharge. [step] 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. [substeps] 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.