Common allergies come from flea bites, contact with foreign substances, inhalant and food allergies. For flea bite allergy, the symptoms are hair loss and skin infections. The first step is to eliminate fleas by using flea powders, sprays, shampoos and dips. Follow instructions and avoid excessive exposure to these as chemicals are hazardous to health. Dog products are unique to dogs and can't be used on cats.
Inhalant allergies come form inhaling pollen, house dust or mold.
To overcome this, you need to identify and remove the offensive culprit. Your vet mat try hyposensitization or low doses of steroids on your pet. This is a series of shots to desensitize your pet to the allergen. Steroids help to relieve allergy symptoms. Contact allergies are due to contact with chemicals or materials like insecticides, soaps, carpets, paint, grass pollen and others.