Normal body temperature is 100-102.5
You can give aspirin at a dose of 5mg per pound every 12 hours with food by mouth.
For chest congestion you can give Robitussin dm 1/2 tsp every 6 hours.
Now if you dog is having difficulty breathing, not eating, vomiting, having diarrhea, coughing up phlegm, has yellow or green nasal drainage, a fever over 104, is very lethargic, or just not right I would go to the emergency clinic tonight.
If your baby is still couging Monday go to your regular vet for an exam and possible antibiotics. Have his heart checked too.
Use a humidifier too!