If he's acting normal other than the snotty nose, its most likely allergies. If the discharge is clear, that's a good sign. If it turns cloudy or green\yellow, it usually means there's an infection somewhere (be it the flu, sinus, teeth, etc. ) and then would be the time to have a vet take a look. If they do have a cold\flu, they normally run a temperature, are often off their feed a bit, and are cranky and tired. I'd keep an eye on him. If the discharge doesn't stop in the next few days, or if it changes color, I would give the vet a call (even if its just for advice- they will usually let you know if they think its something serious, or something to just monitor and see).
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