Doggie is my friend

Today is Mother's day and we went to my parents. They were taking care of my sister's dog a beagle named Rocky. Rocky was in a cage and Nathan loves dogs, well every chance Nathan got he was over by Rocky, sticking his fingers in the cage, talking to him, giving him toys, etc. You know what....NO reaction at all. I know that Nathan had to have some dog saliva on his hands and didn't react. Last time he was around Rocky and Rocky licked him, he broke out in hives. Does this mean his dog allergy is getting better?? We can only hope.