I know this thread is about dogs, but I have a cat that is actually allergic to canned cat food if it has fish in it. She gets runny eyes and nose and has a tough time breathing. Our vet gave us steroids if it gets too bad or just a decongestant for the easier days.
Our dog has summer allergies when the pollen flies, he sneezes and his eyes get runny. I guess the statement "Pets are people too" really is true