Careful of soy w/boys due to hormone... can make their 'manhood' small says research. Have the dairy/egg/soy/peanut allergy thing here. We do rice milk. Not bad really, and fortified w/calcium and vitamin D. Get rice dream, some others have soy in them.
Whey and Casiene are the biggies but i read there's like 24 things in cow's milk people are allergic too. You can try oat milk but its hard to find. I heard people do Goat milk but expensive and frequently people have allergies to both. By the way, if they are doing a scratch test, bring in whole milk w/you cuz it didn't show up w/us until i gave them actual milk to use... and it showed up in blood test. They tell me because there's so many things people are allergic to it doesn't always show up.
There are some chicken nuggets out there w/o dairy.
Hot dogs are usually ok.
Teddy grahams are good instead of gold fish.
pretzels
Ritz crackers are okay too.
There's some animal crackers that do not have dairy, read labels.
Stay away from all canned noodle stuff, my son likes multi colored twisty noodles (forget the name).
We use earth balance butter substitute, as margarines have no dairy, but if concerned about egg, ... there's egg in all of them but Earth balance (vegan).
Watch bread labels... but the more sticks and gravel as my sister says... usually less likely to ahve whey/milk/casiene. ...
I just found chocolate chips that don't have dairy.
Unfort w/chocolate and breads the more expensive they are the less likely they have it.
We make pancackes w/rice milk.
cherrios (sp?)
Wheatables i think are okay.
avacados
make your own meatballs
oatmeal, plain (not those cream ones)
i had trouble finding fish sticks but i think that was cuz of the egg.
RICE DREAM ice cream, or toufoutti which is SO GOOD but soy.
need any more ideas just ask.
i find myself baking a lot and really find that things can taste just as good and more healthy w/o milk (and in our case eggs).
good luck.
it's not such a big deal when you figure it out and see how much happier your son will be : ))