A nasal wash can help remove mucus from your child's nose. You can buy a saline spray at a drugstore or make one at home. To make one, use 1 cup (240 milliliters) of warm water, 1/2 teaspoon (3 grams) of salt, and a pinch of baking soda.
Coud it be allergies? I do remember when his father had their big german shepard upstairs he contantly came home with watery eyes and a runny nose and then once the german shepard had to stay downstairs he stopped comin home with runny noses and watery eye.
A runny nose is caused by viruses, but bacteria constantly living in the nasopharynx start to propagate in a weakened child’s organism. Initially viral, rhinitis became a bacterial one. And this bacterial rhinitis is not an independent disease but a complication of a viral infection.
Also with allergies, the mucus coming out of your child's nose will continue to run clear, rather than thickening and turning yellow or green as it tends to in children with colds. Allergies don't cause a fever, and they tend to show up in the spring, summer, and early fall.