My DS is PA & egg allergic, but we are not yet sure about animals yet. However, the list of items to avoid that I have for PA includes dog food/treats. Evidently they use peanut products in a lot of pet foods even if they do not state peanut butter flavored. We keep him away from the pet food bowls - afraid for him to even touch the food. Newly diagnosed with his PA, we went to visit family and even after explaining his allergy, and they said they understood. A couple hours later they were using a big glob of peanut butter to give their dog some medicines. So I would definately say there is at least cross contamination there

We have a new puppy. His dog food has eggs in it.
I noticed at Target last week that Milkbones now has a peanut flavored treat.
I would say some of these reactions you are describing are from the dog food residue.

Thanks for sharing your story. It never occurred to me that I should explain very clearly to my daughter which allergens could require an EPI and which allergens could require "breathing medicines". I bet she thinks the same thing, well, at least until she gets home from school today.
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Keep Smiling
DD - allergic to peanuts, tree nuts, coconut, and egg

Are you sure that he is allergic to dogs or could he be reacting to peanut residue in the dogs mouth. My son has had these kind of reactions when licked by dogs too but he tested negative to dog. After asking, we could almost always trace it back to the fact that the dog was either given PB to take medicine or the dog was given a treat that was PB flavored. There are a lot of PB dog treats out there.
Usually dog allergies result in itchy eyes and runny noses but not generally hives. I'm not saying that this can't be the case but I would suggest testing for dog allergy to make sure.
We avoid dogs as much as possible too.

I agree with MimiM about a food allergen being in the dog's saliva. Our son had hives after being licked by a friend's dog. He had never reacted to his grandmother's or aunts dog's (their food is now checked for allergens). He also skin tested neg. for dog more than once.
We got a puppy last Christmas and we've had no trouble with hives or any increase in allergies or asthma (I'm knocking on wood now). We are very careful with dog food (she eats California Natural which has no egg,peanut, and tree nut listed in the ingredients) and we use only a couple of dog treats which we've checked.
Maybe you could explore this possibility and if this is the case ease your sons fears. Then it wouldn't be the dog causing the allergic reaction merely what they ate.
Surprisingly alot of people give their dogs peanut butter--we've been training our dog and the trainer recommends giving the dog a Kong (a hollow toy) and filling it with peanut butter!!! We do use this method but with soybutter!!
Take care.

I am not allergic to peanuts/tree nuts--my children are--anyways
I am allergic to dogs and cats---hives, breathing problems are my first symptoms--runny nose itchy eyes follow
My new approach--which seems to be working really well---if I know I am going to a friends house that has animals--I take an antihistime before I go---I can stay a couple of hours now--where as before I could only stay 20 minutes--then I took my medicine--usually needing an inhaler and benedryl--and feeling horrible the rest f the day.
Just my experience
--my children take zyrtec and other asthma medicine everyday--so animals tend to not bother them for a couple of hours.

My 3 year old grandson reacts to dogs the same way - he gets hives where the dog licked him. He'll even get hives from playing on carpeting where a dog has been. He isn't PA. Poor kid LOVES puppies too. He's also allergic to cats.

My DS has been tested for a bunch of foods and all negative.. if he's licked by a dog his face gets fire engine red and starts to swell. No other symptoms..