The most often symptoms when it is about cat allergy are: Wet, red colored, itchy and swollen eyes Areas of the skin covered with the red color Sneezing, Runny nose and post nasal drip Wheezing and coughing Stuffed up ears Nasal congestion and others Controlling of Cat Allergy The best solution is avoiding of the symptoms which cause allergy at you. At last the worst result it total failure of the organs in your body. Hypersensitized State And How Does Your Immune System Comes Into It There are more doctrines about how immune system goes into a hypersensitized state. The most logical explanation is that allergies are connected with genetic codes and that they always caused by protein. It is because, once that you do this, you will know how and when to avoid them. Also, it is very good if you could to do blood testing. This is very good solution for seeing, are you allergic on a mold. Still, the main problem with this analyze is because, there are various mutants of molds, so it is little bit difficult to do testing of each type of the mold. These hypo-allergenic breeds are also known as low allergy dogs and allergy friendly dogs. Still, there are and tips which you may follow for properly controlling of your environment with the dogs: Try to avoid keeping dog near of your bedroom or even bed Use HEPA filter in all places of your home Use electrostatic filters for cleaning air in your home If you have carpets you should to free of them, especially if your dog is in home. Actually, these substances are not harmful to you, but your immune system mistakenly believes that they are. When it is about food allergies, allergic symptoms are affecting of various parts of the body, but the most usually are in gastrointestinal track, respiratory system, cardiovascular system and at last skin. Filters for Air Filters for air are good for filtering the air of airborne allergens, but still these product will not clear and filter air from dust mites allergens. It is because dust mites need to be vacuumed or cleaned. For freeing of dust mites you will need regular hygiene of your home. Still, with the words of experts, you may trust to HEPA, which is shortcuts of High Efficiency Particulate Air Filter, which gives results of cleaning air from dust mites.