Cold vs. allergy: how do I know the difference

Symptoms Allergy Cold 
Runny nose often often
Sneezing often sometimes
Itchy eyes often rarely
Fever  never  often
Aches and pains  never  sometimes 
Headache  sometimes   often 
Cough  sometimes   often  
Dizziness  sometimes   often 
Hoarseness sometimes   often  
Recur at a certain time of year  often   rarely 
Need for antibiotics  no  no  
Warning time  symptoms occur after exposure to allergen  gets worse over several days 
How long does it last  As long as your child is exposed to the allergen  usually 7 to 10 days