Fleas can cause a skin allergy in dogs.

 Dog skin allergies are extremely common and can come from food, bugs or your dog's environment.
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Pet allergies are one of the most common medical problems and people commonly seek medical advice for dealing with them. The doctors who will be well qualified to discuss this issue with you in greater detail include your primary care doctor. Allergies to dogs are quite common, and are usually provoked by allergens in the dead dry skin that flakes off of the dog and settles on furniture and other surfaces and also floats in the air. Dog allergies most commonly manifest as itchy eyes, nasal congestion and sneezing, and in more serious cases cough, wheezing, and asthma like symptoms. However, skin rash can also be a symptoms. The common rash is 'hives' which are itchy and come and go in patches over the skin, just as you describe. In other words, it is highly likely that this rash is a reaction to the dog, but you also should consider other possible exposures which may be new (soaps, laundry detergents, chemicals, etc). As always the diagnosis and the management of your particular concerns will require a physical examination by your personal physician. Setting up an office visit with your primary care doctor might be indicated.
Dog skin allergies can leave owners feeling almost as miserable as their pets.
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A skin-prick test is the most common way of diagnosing a dog allergy. For this test, a small amount of an extract of dog allergen is placed on your skin. Your skin is then pricked with a small, sterile probe, allowing the liquid to seep under the skin’s surface. You’ll then be monitored for swelling and redness or other signs of a reaction, signaling an allergy. Results typically become evident within 15 to 20 minutes. Let's learn more about the different types of skin allergies dogs can be subject to.
Photo provided by FlickrSkin allergies in dogs are sometimes called atopy or atopic dermatitis.
Photo provided by FlickrSkin allergies are more common in adult dogs, after the age of 2 or 3.
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Yucca is a natural anti-inflammatory that helps the immune system function normally. It helps resolve symptoms without side effects common with steroids. Yucca should be given daily for allergies. , a concentrated liquid medication is a powerful product that is safe for cats and dogs with allergies. It can also be given in your pet's food or applied directly to areas of itching skin.Symptoms of inhalant allergies include: SCRATCHING, BITING, CHEWINGAT FEET AND CONSTANT LICKING. The itching may be most severe on feet,flanks, groin and armpits. Dogs may rub their face on the carpet. Earflaps may become red and hot. Chronic ear infections may follow. Skinbecomes thickened, greasy and has a strong odor. Hot spots may developdue to irritation from constant chewing or scratching, which is thenfollowed by infection. Allergies have also been implicated as a possiblecause of Acral Lick Granulomas, a frustrating, treatment resistantcondition whereby the dog creates a sore on his skin from constantlickingIf a dog has the above symptoms and responds well to the treatmentmeasures outlined below, no further diagnostic tests may be needed. Ifthe problem is severe and does not respond to simple measures, allergyskin testing can be done. A portion of the skin is shaved and a varietyof substances are injected into the skin to see if they provoke areaction. If so, an individual series of injections are formulated togive the dog over a period of time (there are blood tests designed toidentify allergens without the skin testing, however their efficacy hadnot been proven. They should be reserved for cases where skin testing isnot possible).Hot Spot or Skin treatment for dogs -spring or distilled water -tea tree oil -hydrocortisone cream Mix water, tea tree oil and a few squirts of hydro. Cream in a spray bottle. Mix well. Spray on dogs skin 2-3 times daily. Good for hot spots, ringworm, allergies and more. Try not to let them lick the area but most pets don't like the smell of tea tree oil so they won't lick. Works like a charm! Compare to vitamin worlds dog skin care treatment.The medical term for scratching related to excessive itching is pruritus. This is the second most common reason people take their dogs to the vet (gastrointestinal problems such as top the list). The causes of pruritus can be quite complex, but there are two main reasons why dogs itch. The first has to do with the condition of the skin itself: Is it infected? Is it too oily? Is it too dry? Of these three, dry skin is a frequent occurrence. The second major cause of pruritus is allergies.