If your dog is sneezing, coughing, or exhibits abnormal behavior that lasts for a short period of time but is not tied to a major disease, he might be suffering from allergies. Some allergies can be temporary, seasonal or even require a lifestyle change for your dog. With that said, many of your dog's discomfort from his allergic reactions can be alleviated. Be aware of the typical allergens, what can trigger a reaction, and what you can do prevent allergic attacks. Some of the most common allergies include airborne irritants, allergies to food ingredients, contact dermatitis and parasitic dermatitis (fleas). Get more details on each type of allergy, the do's and don'ts of treatment, and even home-made remedies below.